Features * High-performance, Low-power 8/16-bit Atmel(R) AVR(R) XMEGATM Microcontroller * Non-volatile Program and Data Memories * * * * * - 64 KB - 256 KB of In-System Self-Programmable Flash - 4 KB - 8 KB Boot Code Section with Independent Lock Bits - 2 KB - 4 KB EEPROM - 4 KB - 16 KB Internal SRAM Peripheral Features - Four-channel DMA Controller with support for external requests - Eight-channel Event System - Seven 16-bit Timer/Counters Four Timer/Counters with 4 Output Compare or Input Capture channels Three Timer/Counters with 2 Output Compare or Input Capture channels High Resolution Extensions on all Timer/Counters Advanced Waveform Extension on one Timer/Counter - Seven USARTs IrDA Extension on 1 USART - AES and DES Crypto Engine - Two Two-wire Interfaces with dual address match (I2C and SMBus compatible) - Three SPI (Serial Peripheral Interfaces) - 16-bit Real Time Counter with Separate Oscillator - Two Eight-channel, 12-bit, 2 Msps Analog to Digital Converters - One Two-channel, 12-bit, 1 Msps Digital to Analog Converter - Four Analog Comparators with Window compare function - External Interrupts on all General Purpose I/O pins - Programmable Watchdog Timer with Separate On-chip Ultra Low Power Oscillator Special Microcontroller Features - Power-on Reset and Programmable Brown-out Detection - Internal and External Clock Options with PLL - Programmable Multi-level Interrupt Controller - Sleep Modes: Idle, Power-down, Standby, Power-save, Extended Standby - Advanced Programming, Test and Debugging Interfaces JTAG (IEEE 1149.1 Compliant) Interface for test, debug and programming PDI (Program and Debug Interface) for programming, test and debugging I/O and Packages - 50 Programmable I/O Lines - 64-lead TQFP - 64-pad QFN Operating Voltage - 1.6 - 3.6V Speed performance - 0 - 12 MHz @ 1.6 - 3.6V - 0 - 32 MHz @ 2.7 - 3.6V 8/16-bit XMEGA A3 Microcontroller ATxmega256A3 ATxmega192A3 ATxmega128A3 ATxmega64A3 Typical Applications * * * * * Industrial control Factory automation Building control Board control White Goods * * * * * Climate control ZigBee Motor control Networking Optical * * * * * Hand-held battery applications Power tools HVAC Metering Medical Applications 8068T-AVR-12/10 XMEGA A3 1. Ordering Information Ordering Code ATxmega256A3-AU Flash E2 SRAM Speed (MHz) Power Supply 256 KB + 8 KB 4 KB 16 KB 32 1.6 - 3.6V ATxmega192A3-AU 192 KB + 8 KB 2 KB 16 KB 32 1.6 - 3.6V ATxmega128A3-AU 128 KB + 8 KB 2 KB 8 KB 32 1.6 - 3.6V ATxmega64A3-AU 64 KB + 4 KB 2 KB 4 KB 32 1.6 - 3.6V ATxmega256A3-MH 256 KB + 8 KB 4 KB 16 KB 32 1.6 - 3.6V ATxmega192A3-MH 192 KB + 8 KB 2 KB 16 KB 32 1.6 - 3.6V ATxmega128A3-MH 128 KB + 8 KB 2 KB 8 KB 32 1.6 - 3.6V ATxmega64A3-MH 64 KB + 4 KB 2 KB 4 KB 32 1.6 - 3.6V Notes: 1. 2. 3. Package(1)(2)(3) Temp 64A -40C - 85C 64M2 This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information. Pb-free packaging, complies to the European Directive for Restriction of Hazardous Substances (RoHS directive). Also Halide free and fully Green. For packaging information, see "Packaging information" on page 61. Package Type 64A 64-lead, 14 x 14 mm Body Size, 1.0 mm Body Thickness, 0.8 mm Lead Pitch, Thin Profile Plastic Quad Flat Package (TQFP) 64M2 64-Pad, 9 x 9 x 1.0 mm Body, Lead Pitch 0.50 mm, 7.65 mm Exposed Pad, Quad Flat No-Lead Package (QFN) 2 8068T-AVR-12/10 XMEGA A3 2. Pinout/Block Diagram ADC A OSC/CLK Control PF5 PF4 PF3 BOD VREF POR TEMP RTC OCD AC A0 Power Control AC A1 FLASH CPU ADC B Reset Control DAC B RAM DMA AC B0 E2PROM Interrupt Controller Watchdog AC B1 Event System ctrl DATA BU S USART0 SPI TWI T/C0 Port F 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 PF2 PF1 PF0 VCC GND PE7 PE6 PE5 PE4 PE3 PE2 PE1 PE0 VCC GND PD7 PD2 PD3 PD4 PD5 PD6 27 28 29 30 31 32 Port E PD0 PD1 GND VCC USART0:1 T/C0:1 SPI USART0:1 Port D 25 26 Port C T/C0:1 SPI TWI USART0:1 EVENT ROUTING NETWORK PC1 PC2 PC3 PC4 PC5 PC6 PC7 Notes: VCC GND PF7 PF6 55 54 53 52 51 50 49 57 56 DATA BU S T/C0:1 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Port R 17 18 19 20 21 22 23 24 PA5 PA6 PA7 PB0 PB1 PB2 PB3 PB4 PB5 PB6 PB7 GND VCC PC0 48 1 2 Port A PA3 PA4 PA2 PA1 PA0 AVCC GND PR1 PR0 RESET/PDI PDI INDEX CORNER 64 63 62 61 60 59 58 Block diagram and pinout. Port B Figure 2-1. 1. For full details on pinout and alternate pin functions refer to "Pinout and Pin Functions" on page 49. 2. The large center pad underneath the QFN/MLF package should be soldered to ground on the board to ensure good mechanical stability. 3 8068T-AVR-12/10 XMEGA A3 3. Overview The Atmel(R) AVR(R) XMEGATM A3 is a family of low power, high performance and peripheral rich CMOS 8/16-bit microcontrollers based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the XMEGA A3 achieves throughputs approaching 1 Million Instructions Per Second (MIPS) per MHz allowing the system designer to optimize power consumption versus processing speed. The AVR CPU combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction, executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs many times faster than conventional single-accumulator or CISC based microcontrollers. The XMEGA A3 devices provide the following features: In-System Programmable Flash with Read-While-Write capabilities, Internal EEPROM and SRAM, four-channel DMA Controller, eight-channel Event System, Programmable Multi-level Interrupt Controller, 50 general purpose I/O lines, 16-bit Real Time Counter (RTC), seven flexible 16-bit Timer/Counters with compare modes and PWM, seven USARTs, two Two Wire Serial Interfaces (TWIs), three Serial Peripheral Interfaces (SPIs), AES and DES crypto engine, two 8-channel 12-bit ADCs with optional differential input with programmable gain, one 2-channel 12-bit DACs, four analog comparators with window mode, programmable Watchdog Timer with separate Internal Oscillator, accurate internal oscillators with PLL and prescaler and programmable Brown-Out Detection. The Program and Debug Interface (PDI), a fast 2-pin interface for programming and debugging, is available. The devices also have an IEEE std. 1149.1 compliant JTAG test interface, and this can also be used for On-chip Debug and programming. The XMEGA A3 devices have five software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, DMA Controller, Event System, Interrupt Controller and all peripherals to continue functioning. The Power-down mode saves the SRAM and register contents but stops the oscillators, disabling all other functions until the next TWI or pin-change interrupt, or Reset. In Power-save mode, the asynchronous Real Time Counter continues to run, allowing the application to maintain a timer base while the rest of the device is sleeping. In Standby mode, the Crystal/Resonator Oscillator is kept running while the rest of the device is sleeping. This allows very fast start-up from external crystal combined with low power consumption. In Extended Standby mode, both the main Oscillator and the Asynchronous Timer continue to run. To further reduce power consumption, the peripheral clock for each individual peripheral can optionally be stopped in Active mode and Idle sleep mode. The device is manufactured using Atmel's high-density nonvolatile memory technology. The program Flash memory can be reprogrammed in-system through the PDI or JTAG. A Bootloader running in the device can use any interface to download the application program to the Flash memory. The Bootloader software in the Boot Flash section will continue to run while the Application Flash section is updated, providing true Read-While-Write operation. By combining an 8/16-bit RISC CPU with In-System Self-Programmable Flash, the Atmel XMEGA A3 is a powerful microcontroller family that provides a highly flexible and cost effective solution for many embedded applications. The XMEGA A3 devices are supported with a full suite of program and system development tools including: C compilers, macro assemblers, program debugger/simulators, programmers, and evaluation kits. 4 8068T-AVR-12/10 XMEGA A3 3.1 Block Diagram Figure 3-1. XMEGA A3 Block Diagram PR[0..1] XTAL1 PORT R (2) XTAL2 Oscillator Circuits/ Clock Generation Watchdog Oscillator Real Time Counter Watchdog Timer DATA BUS PA[0..7] PORT A (8) Event System Controller ACA SRAM DMA Controller ADCA VCC Power Supervision POR/BOD & RESET Oscillator Control GND Sleep Controller RESET/ PDI_CLK PDI PDI_DATA AREFA BUS Controller VCC/10 Prog/Debug Controller JTAG Int. Ref. Tempref DES PORT B OCD AREFB CPU Interrupt Controller AES ADCB NVM Controller PB[0..7]/ JTAG USARTF0 PORT B (8) TCF0 Flash EEPROM PORT F (8) ACB PF[0..7] DACB IRCOM DATA BUS TWIE SPIE TCE0:1 USARTE0:1 SPID USARTD0:1 TCD0:1 TWIC SPIC TCC0:1 USARTC0:1 EVENT ROUTING NETWORK To Clock Generator PORT C (8) PORT D (8) PORT E (8) TOSC1 TOSC2 PC[0..7] PD[0..7] PE[0..7] 5 8068T-AVR-12/10 XMEGA A3 4. Resources A comprehensive set of development tools, application notes and datasheets are available for download on http://www.atmel.com/avr. 4.1 Recommended reading * XMEGA Manual * XMEGA Application Notes This device data sheet only contains part specific information and a short description of each peripheral and module. The XMEGA Manual describes the modules and peripherals in depth. The XMEGA application notes contain example code and show applied use of the modules and peripherals. The XMEGA Manual and Application Notes are available from http://www.atmel.com/avr. 5. Disclaimer For devices that are not available yet, typical values contained in this datasheet are based on simulations and characterization of other AVR XMEGA microcontrollers manufactured on the same process technology. Min. and Max values will be available after the device is characterized. 6 8068T-AVR-12/10 XMEGA A3 6. AVR CPU 6.1 Features * 8/16-bit high performance AVR RISC Architecture * * * * * * * 6.2 - 138 instructions - Hardware multiplier 32x8-bit registers directly connected to the ALU Stack in RAM Stack Pointer accessible in I/O memory space Direct addressing of up to 16M bytes of program and data memory True 16/24-bit access to 16/24-bit I/O registers Support for 8-, 16- and 32-bit Arithmetic Configuration Change Protection of system critical features Overview The XMEGA A3 uses an 8/16-bit AVR CPU. The main function of the AVR CPU is to ensure correct program execution. The CPU must therefore be able to access memories, perform calculations and control peripherals. Interrupt handling is described in a separate section. Figure 6-1 on page 7 shows the CPU block diagram. Figure 6-1. CPU block diagram DATA BUS Flash Program Memory Program Counter OCD Instruction Register STATUS/ CONTROL Instruction Decode 32 x 8 General Purpose Registers ALU Multiplier/ DES DATA BUS Peripheral Module 1 Peripheral Module 2 SRAM EEPROM PMIC The AVR uses a Harvard architecture - with separate memories and buses for program and data. Instructions in the program memory are executed with a single level pipeline. While one instruction is being executed, the next instruction is pre-fetched from the program memory. 7 8068T-AVR-12/10 XMEGA A3 This concept enables instructions to be executed in every clock cycle. The program memory is In-System Re-programmable Flash memory. 6.3 Register File The fast-access Register File contains 32 x 8-bit general purpose working registers with a single clock cycle access time. This allows single-cycle Arithmetic Logic Unit (ALU) operation. In a typical ALU operation, two operands are output from the Register File, the operation is executed, and the result is stored back in the Register File - in one clock cycle. Six of the 32 registers can be used as three 16-bit indirect address register pointers for Data Space addressing - enabling efficient address calculations. One of these address pointers can also be used as an address pointer for look up tables in Flash program memory. 6.4 ALU - Arithmetic Logic Unit The high performance Arithmetic Logic Unit (ALU) supports arithmetic and logic operations between registers or between a constant and a register. Single register operations can also be executed. Within a single clock cycle, arithmetic operations between general purpose registers or between a register and an immediate are executed. After an arithmetic or logic operation, the Status Register is updated to reflect information about the result of the operation. The ALU operations are divided into three main categories - arithmetic, logical, and bit-functions. Both 8- and 16-bit arithmetic is supported, and the instruction set allows for easy implementation of 32-bit arithmetic. The ALU also provides a powerful multiplier supporting both signed and unsigned multiplication and fractional format. 6.5 Program Flow When the device is powered on, the CPU starts to execute instructions from the lowest address in the Flash Program Memory `0'. The Program Counter (PC) addresses the next instruction to be fetched. After a reset, the PC is set to location `0'. Program flow is provided by conditional and unconditional jump and call instructions, capable of addressing the whole address space directly. Most AVR instructions use a 16-bit word format, while a limited number uses a 32-bit format. During interrupts and subroutine calls, the return address PC is stored on the Stack. The Stack is effectively allocated in the general data SRAM, and consequently the Stack size is only limited by the total SRAM size and the usage of the SRAM. After reset the Stack Pointer (SP) points to the highest address in the internal SRAM. The SP is read/write accessible in the I/O memory space, enabling easy implementation of multiple stacks or stack areas. The data SRAM can easily be accessed through the five different addressing modes supported in the AVR CPU. 8 8068T-AVR-12/10 XMEGA A3 7. Memories 7.1 Features * Flash Program Memory - One linear address space - In-System Programmable - Self-Programming and Bootloader support - Application Section for application code - Application Table Section for application code or data storage - Boot Section for application code or bootloader code - Separate lock bits and protection for all sections - Built in fast CRC check of a selectable flash program memory section * Data Memory - One linear address space - Single cycle access from CPU - SRAM - EEPROM Byte and page accessible Optional memory mapping for direct load and store - I/O Memory Configuration and Status registers for all peripherals and modules 16 bit-accessible General Purpose Register for global variables or flags - Bus arbitration Safe and deterministic handling of CPU and DMA Controller priority - Separate buses for SRAM, EEPROM, I/O Memory and External Memory access Simultaneous bus access for CPU and DMA Controller * Production Signature Row Memory for factory programmed data Device ID for each microcontroller device type Serial number for each device Oscillator calibration bytes ADC, DAC and temperature sensor calibration data * User Signature Row One flash page in size Can be read and written from software Content is kept after chip erase 7.2 Overview The AVR architecture has two main memory spaces, the Program Memory and the Data Memory. In addition, the XMEGA A3 features an EEPROM Memory for non-volatile data storage. All three memory spaces are linear and require no paging. The available memory size configurations are shown in "Ordering Information" on page 2. In addition each device has a Flash memory signature row for calibration data, device identification, serial number etc. Non-volatile memory spaces can be locked for further write or read/write operations. This prevents unrestricted access to the application software. 9 8068T-AVR-12/10 XMEGA A3 7.3 In-System Programmable Flash Program Memory The XMEGA A3 devices contains On-chip In-System Programmable Flash memory for program storage, see Figure 7-1 on page 10. Since all AVR instructions are 16- or 32-bits wide, each Flash address location is 16 bits. The Program Flash memory space is divided into Application and Boot sections. Both sections have dedicated Lock Bits for setting restrictions on write or read/write operations. The Store Program Memory (SPM) instruction must reside in the Boot Section when used to write to the Flash memory. A third section inside the Application section is referred to as the Application Table section which has separate Lock bits for storage of write or read/write protection. The Application Table section can be used for storing non-volatile data or application software. Figure 7-1. Flash Program Memory (Hexadecimal address) Word Address 0 Application Section (256 KB/192 KB/128 KB/64 KB) ... 1EFFF / 16FFF / EFFF / 77FF 1F000 / 17000 / F000 / 7800 1FFFF / 17FFF / FFFF / 7FFF 20000 / 18000 / 10000 / 8000 20FFF / 18FFF / 10FFF / 87FF Application Table Section (8 KB/8 KB/8 KB/4 KB) Boot Section (8 KB/8 KB/8 KB/4 KB) The Application Table Section and Boot Section can also be used for general application software. 10 8068T-AVR-12/10 XMEGA A3 7.4 Data Memory The Data Memory consist of the I/O Memory, EEPROM and SRAM memories, all within one linear address space, see Figure 7-2 on page 11. To simplify development, the memory map for all devices in the family is identical and with empty, reserved memory space for smaller devices. Figure 7-2. Data Memory Map (Hexadecimal address) Byte Address 0 FFF 1000 17FF ATxmega192A3 I/O Registers (4 KB) EEPROM (2 KB) Byte Address 0 FFF 1000 17FF RESERVED 2000 5FFF Internal SRAM (16 KB) ATxmega128A3 I/O Registers (4 KB) EEPROM (2 KB) Byte Address 0 FFF 1000 17FF RESERVED 2000 3FFF Internal SRAM (8 KB) ATxmega64A3 I/O Registers (4 KB) EEPROM (2 KB) RESERVED 2000 2FFF Byte Address 0 FFF Internal SRAM (4 KB) ATxmega256A3 I/O Registers (4 KB) 1000 EEPROM (4 KB) 1FFF 2000 5FFF Internal SRAM (16 KB) 11 8068T-AVR-12/10 XMEGA A3 7.4.1 I/O Memory All peripherals and modules are addressable through I/O memory locations in the data memory space. All I/O memory locations can be accessed by the Load (LD/LDS/LDD) and Store (ST/STS/STD) instructions, transferring data between the 32 general purpose registers in the CPU and the I/O Memory. The IN and OUT instructions can address I/O memory locations in the range 0x00 - 0x3F directly. I/O registers within the address range 0x00 - 0x1F are directly bit-accessible using the SBI and CBI instructions. The value of single bits can be checked by using the SBIS and SBIC instructions on these registers. The I/O memory address for all peripherals and modules in XMEGA A3 is shown in the "Peripheral Module Address Map" on page 56. 7.4.2 SRAM Data Memory The XMEGA A3 devices have internal SRAM memory for data storage. 7.4.3 EEPROM Data Memory The XMEGA A3 devices have internal EEPROM memory for non-volatile data storage. It is addressable either in a separate data space or it can be memory mapped into the normal data memory space. The EEPROM memory supports both byte and page access. 12 8068T-AVR-12/10 XMEGA A3 7.5 Production Signature Row The Production Signature Row is a separate memory section for factory programmed data. It contains calibration data for functions such as oscillators and analog modules. The production signature row also contains a device ID that identify each microcontroller device type, and a serial number that is unique for each manufactured device. The device ID for the available XMEGA A3 devices is shown in Table 7-1 on page 13. The serial number consist of the production LOT number, wafer number, and wafer coordinates for the device. The production signature row can not be written or erased, but it can be read from both application software and external programming. Table 7-1. Device ID bytes for XMEGA A3 devices. Device 7.6 Device ID bytes Byte 2 Byte 1 Byte 0 ATxmega64A3 42 96 1E ATxmega128A3 42 97 1E ATxmega192A3 44 97 1E ATxmega256A3 42 98 1E User Signature Row The User Signature Row is a separate memory section that is fully accessible (read and write) from application software and external programming. The user signature row is one flash page in size, and is meant for static user parameter storage, such as calibration data, custom serial numbers or identification numbers, random number seeds etc. This section is not erased by Chip Erase commands that erase the Flash, and requires a dedicated erase command. This ensures parameter storage during multiple program/erase session and on-chip debug sessions. 13 8068T-AVR-12/10 XMEGA A3 7.7 Flash and EEPROM Page Size The Flash Program Memory and EEPROM data memory are organized in pages. The pages are word accessible for the Flash and byte accessible for the EEPROM. Table 7-2 on page 14 shows the Flash Program Memory organization. Flash write and erase operations are performed on one page at a time, while reading the Flash is done one byte at a time. For Flash access the Z-pointer (Z[m:n]) is used for addressing. The most significant bits in the address (FPAGE) gives the page number and the least significant address bits (FWORD) gives the word in the page. Table 7-2. Devices Flash Page Size Number of words and Pages in the Flash. FWORD FPAGE Application Boot Size (words) Size No of Pages Size No of Pages ATxmega64A3 64 KB + 4 KB 128 Z[7:1] Z[16:8] 64K 256 4 KB 16 ATxmega128A3 128 KB + 8 KB 256 Z[8:1] Z[17:9] 128K 256 8 KB 16 ATxmega192A3 192 KB + 8 KB 256 Z[8:1] Z[18:9] 192K 384 8 KB 16 ATxmega256A3 256 KB + 8 KB 256 Z[8:1] Z[18:9] 256K 512 8 KB 16 Table 7-3 on page 14 shows EEPROM memory organization for the XMEGA A3 devices. EEEPROM write and erase operations can be performed one page or one byte at a time, while reading the EEPROM is done one byte at a time. For EEPROM access the NVM Address Register (ADDR[m:n]) is used for addressing. The most significant bits in the address (E2PAGE) gives the page number and the least significant address bits (E2BYTE) gives the byte in the page. Table 7-3. Devices Number of bytes and Pages in the EEPROM. EEPROM Page Size E2BYTE E2PAGE No of Pages Size (Bytes) ATxmega64A3 2 KB 32 ADDR[4:0] ADDR[10:5] 64 ATxmega128A3 2 KB 32 ADDR[4:0] ADDR[10:5] 64 ATxmega192A3 2 KB 32 ADDR[4:0] ADDR[10:5] 64 ATxmega256A3 4 KB 32 ADDR[4:0] ADDR[11:5] 128 14 8068T-AVR-12/10 XMEGA A3 8. DMAC - Direct Memory Access Controller 8.1 Features * Allows High-speed data transfer * * * * * 8.2 - From memory to peripheral - From memory to memory - From peripheral to memory - From peripheral to peripheral 4 Channels From 1 byte and up to 16 M bytes transfers in a single transaction Multiple addressing modes for source and destination address - Increment - Decrement - Static 1, 2, 4, or 8 bytes Burst Transfers Programmable priority between channels Overview The XMEGA A3 has a Direct Memory Access (DMA) Controller to move data between memories and peripherals in the data space. The DMA controller uses the same data bus as the CPU to transfer data. It has 4 channels that can be configured independently. Each DMA channel can perform data transfers in blocks of configurable size from 1 to 64K bytes. A repeat counter can be used to repeat each block transfer for single transactions up to 16M bytes. Each DMA channel can be configured to access the source and destination memory address with incrementing, decrementing or static addressing. The addressing is independent for source and destination address. When the transaction is complete the original source and destination address can automatically be reloaded to be ready for the next transaction. The DMAC can access all the peripherals through their I/O memory registers, and the DMA may be used for automatic transfer of data to/from communication modules, as well as automatic data retrieval from ADC conversions, data transfer to DAC conversions, or data transfer to or from port pins. A wide range of transfer triggers is available from the peripherals, Event System and software. Each DMA channel has different transfer triggers. To allow for continuous transfers, two channels can be interlinked so that the second takes over the transfer when the first is finished and vice versa. The DMA controller can read from memory mapped EEPROM, but it cannot write to the EEPROM or access the Flash. 15 8068T-AVR-12/10 XMEGA A3 9. Event System 9.1 Features * * * * * * * * 9.2 Inter-peripheral communication and signalling with minimum latency CPU and DMA independent operation 8 Event Channels allows for up to 8 signals to be routed at the same time Events can be generated by - Timer/Counters (TCxn) - Real Time Counter (RTC) - Analog to Digital Converters (ADCx) - Analog Comparators (ACx) - Ports (PORTx) - System Clock (ClkSYS) - Software (CPU) Events can be used by - Timer/Counters (TCxn) - Analog to Digital Converters (ADCx) - Digital to Analog Converters (DACx) - Ports (PORTx) - DMA Controller (DMAC) - IR Communication Module (IRCOM) The same event can be used by multiple peripherals for synchronized timing Advanced Features - Manual Event Generation from software (CPU) - Quadrature Decoding - Digital Filtering Functions in Active and Idle mode Overview The Event System is a set of features for inter-peripheral communication. It enables the possibility for a change of state in one peripheral to automatically trigger actions in one or more peripherals. What changes in a peripheral that will trigger actions in other peripherals are configurable by software. It is a simple, but powerful system as it allows for autonomous control of peripherals without any use of interrupts, CPU or DMA resources. The indication of a change in a peripheral is referred to as an event, and is usually the same as the interrupt conditions for that peripheral. Events are passed between peripherals using a dedicated routing network called the Event Routing Network. Figure 9-1 on page 17 shows a basic block diagram of the Event System with the Event Routing Network and the peripherals to which it is connected. This highly flexible system can be used for simple routing of signals, pin functions or for sequencing of events. The maximum latency is two CPU clock cycles from when an event is generated in one peripheral, until the actions are triggered in one or more other peripherals. The Event System is functional in both Active and Idle modes. 16 8068T-AVR-12/10 XMEGA A3 Figure 9-1. Event system block diagram. PORTx ClkSYS CPU ADCx RTC Event Routing Network DACx IRCOM ACx T/Cxn DMAC The Event Routing Network can directly connect together ADCs, DACs, Analog Comparators (ACx), I/O ports (PORTx), the Real-time Counter (RTC), Timer/Counters (T/C) and the IR Communication Module (IRCOM). Events can also be generated from software (CPU). All events from all peripherals are always routed into the Event Routing Network. This consist of eight multiplexers where each can be configured in software to select which event to be routed into that event channel. All eight event channels are connected to the peripherals that can use events, and each of these peripherals can be configured to use events from one or more event channels to automatically trigger a software selectable action. 17 8068T-AVR-12/10 XMEGA A3 10. System Clock and Clock options 10.1 Features * Fast start-up time * Safe run-time clock switching * Internal Oscillators: * * * * * * 10.2 - 32 MHz run-time calibrated RC oscillator - 2 MHz run-time calibrated RC oscillator - 32.768 kHz calibrated RC oscillator - 32 kHz Ultra Low Power (ULP) oscillator External clock options - 0.4 - 16 MHz Crystal Oscillator - 32.768 kHz Crystal Oscillator - External clock PLL with internal and external clock options with 2 to 31x multiplication Clock Prescalers with 2 to 2048x division Fast peripheral clock running at 2 and 4 times the CPU clock speed Automatic Run-Time Calibration of internal oscillators Crystal Oscillator failure detection Overview XMEGA A3 has an advanced clock system, supporting a large number of clock sources. It incorporates both integrated oscillators, external crystal oscillators and resonators. A high frequency Phase Locked Loop (PLL) and clock prescalers can be controlled from software to generate a wide range of clock frequencies from the clock source input. It is possible to switch between clock sources from software during run-time. After reset the device will always start up running from the 2 Mhz internal oscillator. A calibration feature is available, and can be used for automatic run-time calibration of the internal 2 MHz and 32 MHz oscillators. This reduce frequency drift over voltage and temperature. A Crystal Oscillator Failure Monitor can be enabled to issue a Non-Maskable Interrupt and switch to internal oscillator if the external oscillator fails. Figure 10-1 on page 19 shows the principal clock system in XMEGA A3. 18 8068T-AVR-12/10 XMEGA A3 Figure 10-1. Clock system overview clkULP WDT/BOD 32 kHz ULP Internal Oscillator clkRTC RTC 32.768 kHz Calibrated Internal Oscillator PERIPHERALS ADC 2 MHz Run-Time Calibrated Internal Oscillator 32 MHz Run-time Calibrated Internal Oscillator DAC CLOCK CONTROL clkPER UNIT with PLL and Prescaler PORTS ... DMA INTERRUPT 32.768 KHz Crystal Oscillator EVSYS RAM 0.4 - 16 MHz Crystal Oscillator CPU clkCPU NVM MEMORY External Clock Input FLASH EEPROM Each clock source is briefly described in the following sub-sections. 10.3 10.3.1 Clock Options 32 kHz Ultra Low Power Internal Oscillator The 32 kHz Ultra Low Power (ULP) Internal Oscillator is a very low power consumption clock source. It is used for the Watchdog Timer, Brown-Out Detection and as an asynchronous clock source for the Real Time Counter. This oscillator cannot be used as the system clock source, and it cannot be directly controlled from software. 10.3.2 32.768 kHz Calibrated Internal Oscillator The 32.768 kHz Calibrated Internal Oscillator is a high accuracy clock source that can be used as the system clock source or as an asynchronous clock source for the Real Time Counter. It is calibrated during production to provide a default frequency which is close to its nominal frequency. 19 8068T-AVR-12/10 XMEGA A3 10.3.3 32.768 kHz Crystal Oscillator The 32.768 kHz Crystal Oscillator is a low power driver for an external watch crystal. It can be used as system clock source or as asynchronous clock source for the Real Time Counter. 10.3.4 0.4 - 16 MHz Crystal Oscillator The 0.4 - 16 MHz Crystal Oscillator is a driver intended for driving both external resonators and crystals ranging from 400 kHz to 16 MHz. 10.3.5 2 MHz Run-time Calibrated Internal Oscillator The 2 MHz Run-time Calibrated Internal Oscillator is a high frequency oscillator. It is calibrated during production to provide a default frequency which is close to its nominal frequency. The oscillator can use the 32.768 kHz Calibrated Internal Oscillator or the 32 kHz Crystal Oscillator as a source for calibrating the frequency run-time to compensate for temperature and voltage drift hereby optimizing the accuracy of the oscillator. 10.3.6 32 MHz Run-time Calibrated Internal Oscillator The 32 MHz Run-time Calibrated Internal Oscillator is a high frequency oscillator. It is calibrated during production to provide a default frequency which is close to its nominal frequency. The oscillator can use the 32.768 kHz Calibrated Internal Oscillator or the 32 kHz Crystal Oscillator as a source for calibrating the frequency run-time to compensate for temperature and voltage drift hereby optimizing the accuracy of the oscillator. 10.3.7 External Clock input The external clock input gives the possibility to connect a clock from an external source. 10.3.8 PLL with Multiplication factor 1 - 31x The PLL provides the possibility of multiplying a frequency by any number from 1 to 31. In combination with the prescalers, this gives a wide range of output frequencies from all clock sources. 20 8068T-AVR-12/10 XMEGA A3 11. Power Management and Sleep Modes 11.1 Features * 5 sleep modes - Idle - Power-down - Power-save - Standby - Extended standby * Power Reduction registers to disable clocks to unused peripherals 11.2 Overview The XMEGA A3 provides various sleep modes tailored to reduce power consumption to a minimum. All sleep modes are available and can be entered from Active mode. In Active mode the CPU is executing application code. The application code decides when and which sleep mode to enter. Interrupts from enabled peripherals and all enabled reset sources can restore the microcontroller from sleep to Active mode. In addition, Power Reduction registers provide a method to stop the clock to individual peripherals from software. When this is done, the current state of the peripheral is frozen and there is no power consumption from that peripheral. This reduces the power consumption in Active mode and Idle sleep mode. 11.3 Sleep Modes 11.3.1 Idle Mode In Idle mode the CPU and Non-Volatile Memory are stopped, but all peripherals including the Interrupt Controller, Event System and DMA Controller are kept running. Interrupt requests from all enabled interrupts will wake the device. 11.3.2 Power-down Mode In Power-down mode all system clock sources, and the asynchronous Real Time Counter (RTC) clock source, are stopped. This allows operation of asynchronous modules only. The only interrupts that can wake up the MCU are the Two Wire Interface address match interrupts, and asynchronous port interrupts, e.g pin change. 11.3.3 Power-save Mode Power-save mode is identical to Power-down, with one exception: If the RTC is enabled, it will keep running during sleep and the device can also wake up from RTC interrupts. 11.3.4 Standby Mode Standby mode is identical to Power-down with the exception that all enabled system clock sources are kept running, while the CPU, Peripheral and RTC clocks are stopped. This reduces the wake-up time when external crystals or resonators are used. 21 8068T-AVR-12/10 XMEGA A3 11.3.5 Extended Standby Mode Extended Standby mode is identical to Power-save mode with the exception that all enabled system clock sources are kept running while the CPU and Peripheral clocks are stopped. This reduces the wake-up time when external crystals or resonators are used. 22 8068T-AVR-12/10 XMEGA A3 12. System Control and Reset 12.1 Features * Multiple reset sources for safe operation and device reset - Power-On Reset - External Reset - Watchdog Reset The Watchdog Timer runs from separate, dedicated oscillator - Brown-Out Reset Accurate, programmable Brown-Out levels - PDI reset - Software reset * Asynchronous reset - No running clock in the device is required for reset * Reset status register 12.2 Resetting the AVR During reset, all I/O registers are set to their initial values. The SRAM content is not reset. Application execution starts from the Reset Vector. The instruction placed at the Reset Vector should be an Absolute Jump (JMP) instruction to the reset handling routine. By default the Reset Vector address is the lowest Flash program memory address, `0', but it is possible to move the Reset Vector to the first address in the Boot Section. The I/O ports of the AVR are immediately tri-stated when a reset source goes active. The reset functionality is asynchronous, so no running clock is required to reset the device. After the device is reset, the reset source can be determined by the application by reading the Reset Status Register. 12.3 12.3.1 Reset Sources Power-On Reset The MCU is reset when the supply voltage VCC is below the Power-on Reset threshold voltage. 12.3.2 External Reset The MCU is reset when a low level is present on the RESET pin. 12.3.3 Watchdog Reset The MCU is reset when the Watchdog Timer period expires and the Watchdog Reset is enabled. The Watchdog Timer runs from a dedicated oscillator independent of the System Clock. For more details see "WDT - Watchdog Timer" on page 24. 12.3.4 Brown-Out Reset The MCU is reset when the supply voltage VCC is below the Brown-Out Reset threshold voltage and the Brown-out Detector is enabled. The Brown-out threshold voltage is programmable. 12.3.5 PDI reset The MCU can be reset through the Program and Debug Interface (PDI). 23 8068T-AVR-12/10 XMEGA A3 12.3.6 Software reset The MCU can be reset by the CPU writing to a special I/O register through a timed sequence. 13. WDT - Watchdog Timer 13.1 Features * 11 selectable timeout periods, from 8 ms to 8s. * Two operation modes - Standard mode - Window mode * Runs from the 1 kHz output of the 32 kHz Ultra Low Power oscillator * Configuration lock to prevent unwanted changes 13.2 Overview The XMEGA A3 has a Watchdog Timer (WDT). The WDT will run continuously when turned on and if the Watchdog Timer is not reset within a software configurable time-out period, the microcontroller will be reset. The Watchdog Reset (WDR) instruction must be run by software to reset the WDT, and prevent microcontroller reset. The WDT has a Window mode. In this mode the WDR instruction must be run within a specified period called a window. Application software can set the minimum and maximum limits for this window. If the WDR instruction is not executed inside the window limits, the microcontroller will be reset. A protection mechanism using a timed write sequence is implemented in order to prevent unwanted enabling, disabling or change of WDT settings. For maximum safety, the WDT also has an Always-on mode. This mode is enabled by programming a fuse. In Always-on mode, application software can not disable the WDT. 24 8068T-AVR-12/10 XMEGA A3 14. PMIC - Programmable Multi-level Interrupt Controller 14.1 Features * Separate interrupt vector for each interrupt * Short, predictable interrupt response time * Programmable Multi-level Interrupt Controller - 3 programmable interrupt levels - Selectable priority scheme within low level interrupts (round-robin or fixed) - Non-Maskable Interrupts (NMI) * Interrupt vectors can be moved to the start of the Boot Section 14.2 Overview XMEGA A3 has a Programmable Multi-level Interrupt Controller (PMIC). All peripherals can define three different priority levels for interrupts; high, medium or low. Medium level interrupts may interrupt low level interrupt service routines. High level interrupts may interrupt both lowand medium level interrupt service routines. Low level interrupts have an optional round robin scheme to make sure all interrupts are serviced within a certain amount of time. The built in oscillator failure detection mechanism can issue a Non-Maskable Interrupt (NMI). 14.3 Interrupt vectors When an interrupt is serviced, the program counter will jump to the interrupt vector address. The interrupt vector is the sum of the peripheral's base interrupt address and the offset address for specific interrupts in each peripheral. The base addresses for the XMEGA A3 devices are shown in Table 14-1. Offset addresses for each interrupt available in the peripheral are described for each peripheral in the XMEGA A manual. For peripherals or modules that have only one interrupt, the interrupt vector is shown in Table 14-1. The program address is the word address. Table 14-1. Reset and Interrupt Vectors Program Address (Base Address) Source 0x000 RESET 0x002 OSCF_INT_vect Crystal Oscillator Failure Interrupt vector (NMI) 0x004 PORTC_INT_base Port C Interrupt base 0x008 PORTR_INT_base Port R Interrupt base 0x00C DMA_INT_base DMA Controller Interrupt base 0x014 RTC_INT_base Real Time Counter Interrupt base 0x018 TWIC_INT_base Two-Wire Interface on Port C Interrupt base 0x01C TCC0_INT_base Timer/Counter 0 on port C Interrupt base 0x028 TCC1_INT_base Timer/Counter 1 on port C Interrupt base 0x030 SPIC_INT_vect SPI on port C Interrupt vector 0x032 USARTC0_INT_base USART 0 on port C Interrupt base 0x03D USARTC1_INT_base USART 1 on port C Interrupt base 0x03E AES_INT_vect AES Interrupt vector Interrupt Description 25 8068T-AVR-12/10 XMEGA A3 Table 14-1. Reset and Interrupt Vectors (Continued) Program Address (Base Address) Source Interrupt Description 0x040 NVM_INT_base Non-Volatile Memory Interrupt base 0x044 PORTB_INT_base Port B Interrupt base 0x048 ACB_INT_base Analog Comparator on Port B Interrupt base 0x04E ADCB_INT_base Analog to Digital Converter on Port B Interrupt base 0x056 PORTE_INT_base Port E INT base 0x05A TWIE_INT_base Two-Wire Interface on Port E Interrupt base 0x05E TCE0_INT_base Timer/Counter 0 on port E Interrupt base 0x06A TCE1_INT_base Timer/Counter 1 on port E Interrupt base 0x072 SPIE_INT_vect SPI on port E Interrupt vector 0x074 USARTE0_INT_base USART 0 on port E Interrupt base 0x07A USARTE1_INT_base USART 1 on port E Interrupt base 0x080 PORTD_INT_base Port D Interrupt base 0x084 PORTA_INT_base Port A Interrupt base 0x088 ACA_INT_base Analog Comparator on Port A Interrupt base 0x08E ADCA_INT_base Analog to Digital Converter on Port A Interrupt base 0x09A TCD0_INT_base Timer/Counter 0 on port D Interrupt base 0x0A6 TCD1_INT_base Timer/Counter 1 on port D Interrupt base 0x0AE SPID_INT_vector SPI D Interrupt vector 0x0B0 USARTD0_INT_base USART 0 on port D Interrupt base 0x0B6 USARTD1_INT_base USART 1 on port D Interrupt base 0x0D0 PORTF_INT_base Port F Interrupt base 0x0D8 TCF0_INT_base Timer/Counter 0 on port F Interrupt base 0x0EE USARTF0_INT_base USART 0 on port F Interrupt base 26 8068T-AVR-12/10 XMEGA A3 15. I/O Ports 15.1 Features * Selectable input and output configuration for each pin individually * Flexible pin configuration through dedicated Pin Configuration Register * Synchronous and/or asynchronous input sensing with port interrupts and events * * * * * * * * * 15.2 - Sense both edges - Sense rising edges - Sense falling edges - Sense low level Asynchronous wake-up from all input sensing configurations Two port interrupts with flexible pin masking Highly configurable output driver and pull settings: - Totem-pole - Pull-up/-down - Wired-AND - Wired-OR - Bus-keeper - Inverted I/O Configuration of multiple pins in a single operation Read-Modify-Write (RMW) support Toggle/clear/set registers for Output and Direction registers Clock output on port pin Event Channel 0 output on port pin 7 Mapping of port registers (virtual ports) into bit accessible I/O memory space Overview The XMEGA A3 devices have flexible General Purpose I/O Ports. A port consists of up to 8 pins, ranging from pin 0 to pin 7. The ports implement several functions, including synchronous/asynchronous input sensing, pin change interrupts and configurable output settings. All functions are individual per pin, but several pins may be configured in a single operation. 15.3 I/O configuration All port pins (Pn) have programmable output configuration. In addition, all port pins have an inverted I/O function. For an input, this means inverting the signal between the port pin and the pin register. For an output, this means inverting the output signal between the port register and the port pin. The inverted I/O function can be used also when the pin is used for alternate functions. 27 8068T-AVR-12/10 XMEGA A3 15.3.1 Push-pull Figure 15-1. I/O configuration - Totem-pole DIRn OUTn Pn INn 15.3.2 Pull-down Figure 15-2. I/O configuration - Totem-pole with pull-down (on input) DIRn OUTn Pn INn 15.3.3 Pull-up Figure 15-3. I/O configuration - Totem-pole with pull-up (on input) DIRn OUTn Pn INn 15.3.4 Bus-keeper The bus-keeper's weak output produces the same logical level as the last output level. It acts as a pull-up if the last level was `1', and pull-down if the last level was `0'. 28 8068T-AVR-12/10 XMEGA A3 Figure 15-4. I/O configuration - Totem-pole with bus-keeper DIRn OUTn Pn INn 15.3.5 Others Figure 15-5. Output configuration - Wired-OR with optional pull-down OUTn Pn INn Figure 15-6. I/O configuration - Wired-AND with optional pull-up INn Pn OUTn 29 8068T-AVR-12/10 XMEGA A3 15.4 Input sensing * * * * Sense both edges Sense rising edges Sense falling edges Sense low level Input sensing is synchronous or asynchronous depending on the enabled clock for the ports, and the configuration is shown in Figure 15-7 on page 30. Figure 15-7. Input sensing system overview Asynchronous sensing EDGE DETECT Interrupt Control IREQ Synchronous sensing Pn Synchronizer INn D Q D Q INVERTED I/O R EDGE DETECT Event R When a pin is configured with inverted I/O, the pin value is inverted before the input sensing. 15.5 Port Interrupt Each port has two interrupts with separate priority and interrupt vector. All pins on the port can be individually selected as source for each of the interrupts. The interrupts are then triggered according to the input sense configuration for each pin configured as source for the interrupt. 15.6 Alternate Port Functions In addition to the input/output functions on all port pins, most pins have alternate functions. This means that other modules or peripherals connected to the port can use the port pins for their functions, such as communication or pulse-width modulation. "Pinout and Pin Functions" on page 49 shows which modules on peripherals that enable alternate functions on a pin, and which alternate functions that are available on a pin. 30 8068T-AVR-12/10 XMEGA A3 16. T/C - 16-bits Timer/Counter with PWM 16.1 Features * Seven 16-bit Timer/Counters * * * * * * * * * * * * 16.2 - Four Timer/Counters of type 0 - Three Timer/Counters of type 1 Four Compare or Capture (CC) Channels in Timer/Counter 0 Two Compare or Capture (CC) Channels in Timer/Counter 1 Double Buffered Timer Period Setting Double Buffered Compare or Capture Channels Waveform Generation: - Single Slope Pulse Width Modulation - Dual Slope Pulse Width Modulation - Frequency Generation Input Capture: - Input Capture with Noise Cancelling - Frequency capture - Pulse width capture - 32-bit input capture Event Counter with Direction Control Timer Overflow and Timer Error Interrupts and Events One Compare Match or Capture Interrupt and Event per CC Channel Supports DMA Operation Hi-Resolution Extension (Hi-Res) Advanced Waveform Extension (AWEX) Overview XMEGA A3 has seven Timer/Counters, four Timer/Counter 0 and three Timer/Counter 1. The difference between them is that Timer/Counter 0 has four Compare/Capture channels, while Timer/Counter 1 has two Compare/Capture channels. The Timer/Counters (T/C) are 16-bit and can count any clock, event or external input in the microcontroller. A programmable prescaler is available to get a useful T/C resolution. Updates of Timer and Compare registers are double buffered to ensure glitch free operation. Single slope PWM, dual slope PWM and frequency generation waveforms can be generated using the Compare Channels. Through the Event System, any input pin or event in the microcontroller can be used to trigger input capture, hence no dedicated pins is required for this. The input capture has a noise canceller to avoid incorrect capture of the T/C, and can be used to do frequency and pulse width measurements. A wide range of interrupt or event sources are available, including T/C Overflow, Compare match and Capture for each Compare/Capture channel in the T/C. PORTC, PORTD and PORTE each has one Timer/Counter 0 and one Timer/Counter1. PORTF has one Timer/Counter 0. Notation of these are TCC0 (Time/Counter C0), TCC1, TCD0, TCD1, TCE0, TCE1 and TCF0, respectively. 31 8068T-AVR-12/10 XMEGA A3 Figure 16-1. Overview of a Timer/Counter and closely related peripherals Timer/Counter Base Counter Prescaler clkPER Timer Period Control Logic Counter Event System clkPER4 Buffer Capture Control Waveform Generation DTI Dead-Time Insertion Pattern Generation Fault Protection PORT Comparator AWeX Hi-Res Compare/Capture Channel D Compare/Capture Channel C Compare/Capture Channel B Compare/Capture Channel A The Hi-Resolution Extension can be enabled to increase the waveform generation resolution by 2 bits (4x). This is available for all Timer/Counters. See "Hi-Res - High Resolution Extension" on page 34 for more details. The Advanced Waveform Extension can be enabled to provide extra and more advanced features for the Timer/Counter. This are only available for Timer/Counter 0. See "AWEX - Advanced Waveform Extension" on page 33 for more details. 32 8068T-AVR-12/10 XMEGA A3 17. AWEX - Advanced Waveform Extension 17.1 Features * * * * * * * * 17.2 Output with complementary output from each Capture channel Four Dead Time Insertion (DTI) Units, one for each Capture channel 8-bit DTI Resolution Separate High and Low Side Dead-Time Setting Double Buffered Dead-Time Event Controlled Fault Protection Single Channel Multiple Output Operation (for BLDC motor control) Double Buffered Pattern Generation Overview The Advanced Waveform Extension (AWEX) provides extra features to the Timer/Counter in Waveform Generation (WG) modes. The AWEX enables easy and safe implementation of for example, advanced motor control (AC, BLDC, SR, and Stepper) and power control applications. Any WG output from a Timer/Counter 0 is split into a complimentary pair of outputs when any AWEX feature is enabled. These output pairs go through a Dead-Time Insertion (DTI) unit that enables generation of the non-inverted Low Side (LS) and inverted High Side (HS) of the WG output with dead time insertion between LS and HS switching. The DTI output will override the normal port value according to the port override setting. Optionally the final output can be inverted by using the invert I/O setting for the port pin. The Pattern Generation unit can be used to generate a synchronized bit pattern on the port it is connected to. In addition, the waveform generator output from Compare Channel A can be distributed to, and override all port pins. When the Pattern Generator unit is enabled, the DTI unit is bypassed. The Fault Protection unit is connected to the Event System. This enables any event to trigger a fault condition that will disable the AWEX output. Several event channels can be used to trigger fault on several different conditions. The AWEX is available for TCC0. The notation of this is AWEXC. 33 8068T-AVR-12/10 XMEGA A3 18. Hi-Res - High Resolution Extension 18.1 Features * Increases Waveform Generator resolution by 2-bits (4x) * Supports Frequency, single- and dual-slope PWM operation * Supports the AWEX when this is enabled and used for the same Timer/Counter 18.2 Overview The Hi-Resolution (Hi-Res) Extension is able to increase the resolution of the waveform generation output by a factor of 4. When enabled for a Timer/Counter, the Fast Peripheral clock running at four times the CPU clock speed will be as input to the Timer/Counter. The High Resolution Extension can also be used when an AWEX is enabled and used with a Timer/Counter. XMEGA A3 devices have four Hi-Res Extensions that each can be enabled for each Timer/Counters pair on PORTC, PORTD, PORTE and PORTF. The notation of these are HIRESC, HIRESD, HIRESE and HIRESF, respectively. 34 8068T-AVR-12/10 XMEGA A3 19. RTC - Real-Time Counter 19.1 Features * * * * * * 19.2 16-bit Timer Flexible Tick resolution ranging from 1 Hz to 32.768 kHz One Compare register One Period register Clear timer on Overflow or Compare Match Overflow or Compare Match event and interrupt generation Overview The XMEGA A3 includes a 16-bit Real-time Counter (RTC). The RTC can be clocked from an accurate 32.768 kHz Crystal Oscillator, the 32.768 kHz Calibrated Internal Oscillator, or from the 32 kHz Ultra Low Power Internal Oscillator. The RTC includes both a Period and a Compare register. For details, see Figure 19-1. A wide range of Resolution and Time-out periods can be configured using the RTC. With a maximum resolution of 30.5 s, time-out periods range up to 2000 seconds. With a resolution of 1 second, the maximum time-out period is over 18 hours (65536 seconds). Figure 19-1. Real-time Counter overview Period Overflow 32.768 kHz = 10-bit prescaler 1.024 kHz Counter = Compare Match Compare 35 8068T-AVR-12/10 XMEGA A3 20. TWI - Two Wire Interface 20.1 Features * * * * * * * * * * * * 20.2 Two Identical TWI peripherals Simple yet Powerful and Flexible Communication Interface Both Master and Slave Operation Supported Device can Operate as Transmitter or Receiver 7-bit Address Space Allows up to 128 Different Slave Addresses Multi-master Arbitration Support Up to 400 kHz Data Transfer Speed Slew-rate Limited Output Drivers Noise Suppression Circuitry Rejects Spikes on Bus Lines Fully Programmable Slave Address with General Call Support Address Recognition Causes Wake-up when in Sleep Mode I2C and System Management Bus (SMBus) compatible Overview The Two-Wire Interface (TWI) is a bi-directional wired-AND bus with only two lines, the clock (SCL) line and the data (SDA) line. The protocol makes it possible to interconnect up to 128 individually addressable devices. Since it is a multi-master bus, one or more devices capable of taking control of the bus can be connected. The only external hardware needed to implement the bus is a single pull-up resistor for each of the TWI bus lines. Mechanisms for resolving bus contention are inherent in the TWI protocol. PORTC and PORTE each has one TWI. Notation of these peripherals are TWIC and TWIE. 36 8068T-AVR-12/10 XMEGA A3 21. SPI - Serial Peripheral Interface 21.1 Features * * * * * * * * * 21.2 Three Identical SPI peripherals Full-duplex, Three-wire Synchronous Data Transfer Master or Slave Operation LSB First or MSB First Data Transfer Seven Programmable Bit Rates End of Transmission Interrupt Flag Write Collision Flag Protection Wake-up from Idle Mode Double Speed (CK/2) Master SPI Mode Overview The Serial Peripheral Interface (SPI) allows high-speed full-duplex, synchronous data transfer between different devices. Devices can communicate using a master-slave scheme, and data is transferred both to and from the devices simultaneously. PORTC, PORTD, and PORTE each has one SPI. Notation of these peripherals are SPIC, SPID, and SPIE respectively. 37 8068T-AVR-12/10 XMEGA A3 22. USART 22.1 Features * * * * * * * * * * * * * * * 22.2 Seven Identical USART peripherals Full Duplex Operation (Independent Serial Receive and Transmit Registers) Asynchronous or Synchronous Operation Master or Slave Clocked Synchronous Operation High-resolution Arithmetic Baud Rate Generator Supports Serial Frames with 5, 6, 7, 8, or 9 Data Bits and 1 or 2 Stop Bits Odd or Even Parity Generation and Parity Check Supported by Hardware Data OverRun Detection Framing Error Detection Noise Filtering Includes False Start Bit Detection and Digital Low Pass Filter Three Separate Interrupts on TX Complete, TX Data Register Empty and RX Complete Multi-processor Communication Mode Double Speed Asynchronous Communication Mode Master SPI mode for SPI communication IrDA support through the IRCOM module Overview The Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) is a highly flexible serial communication module. The USART supports full duplex communication, and both asynchronous and clocked synchronous operation. The USART can also be set in Master SPI mode to be used for SPI communication. Communication is frame based, and the frame format can be customized to support a wide range of standards. The USART is buffered in both direction, enabling continued data transmission without any delay between frames. There are separate interrupt vectors for receive and transmit complete, enabling fully interrupt driven communication. Frame error and buffer overflow are detected in hardware and indicated with separate status flags. Even or odd parity generation and parity check can also be enabled. One USART can use the IRCOM module to support IrDA 1.4 physical compliant pulse modulation and demodulation for baud rates up to 115.2 kbps. PORTC, PORTD, and PORTE each has two USARTs, while PORTF has one USART only. Notation of these peripherals are USARTC0, USARTC1, USARTD0, USARTD1, USARTE0, USARTE1 and USARTF0, respectively. 38 8068T-AVR-12/10 XMEGA A3 23. IRCOM - IR Communication Module 23.1 Features * Pulse modulation/demodulation for infrared communication * Compatible to IrDA 1.4 physical for baud rates up to 115.2 kbps * Selectable pulse modulation scheme - 3/16 of baud rate period - Fixed pulse period, 8-bit programmable - Pulse modulation disabled * Built in filtering * Can be connected to and used by one USART at a time 23.2 Overview XMEGA contains an Infrared Communication Module (IRCOM) for IrDA communication with baud rates up to 115.2 kbps. This supports three modulation schemes: 3/16 of baud rate period, fixed programmable pulse time based on the Peripheral Clock speed, or pulse modulation disabled. There is one IRCOM available which can be connected to any USART to enable infrared pulse coding/decoding for that USART. 39 8068T-AVR-12/10 XMEGA A3 24. Crypto Engine 24.1 Features * Data Encryption Standard (DES) CPU instruction * Advanced Encryption Standard (AES) Crypto module * DES Instruction - Encryption and Decryption - Single-cycle DES instruction - Encryption/Decryption in 16 clock cycles per 8-byte block * AES Crypto Module - Encryption and Decryption - Support 128-bit keys - Support XOR data load mode to the State memory for Cipher Block Chaining - Encryption/Decryption in 375 clock cycles per 16-byte block 24.2 Overview The Advanced Encryption Standard (AES) and Data Encryption Standard (DES) are two commonly used encryption standards. These are supported through an AES peripheral module and a DES CPU instruction. All communication interfaces and the CPU can optionally use AES and DES encrypted communication and data storage. DES is supported by a DES instruction in the AVR XMEGA CPU. The 8-byte key and 8-byte data blocks must be loaded into the Register file, and then DES must be executed 16 times to encrypt/decrypt the data block. The AES Crypto Module encrypts and decrypts 128-bit data blocks with the use of a 128-bit key. The key and data must be loaded into the key and state memory in the module before encryption/decryption is started. It takes 375 peripheral clock cycles before the encryption/decryption is done and decrypted/encrypted data can be read out, and an optional interrupt can be generated. The AES Crypto Module also has DMA support with transfer triggers when encryption/decryption is done and optional auto-start of encryption/decryption when the state memory is fully loaded. 40 8068T-AVR-12/10 XMEGA A3 25. ADC - 12-bit Analog to Digital Converter 25.1 Features * * * * * * * * * * * * * 25.2 Two ADCs with 12-bit resolution 2 Msps sample rate for each ADC Signed and Unsigned conversions 4 result registers with individual input channel control for each ADC 8 single ended inputs for each ADC 8x4 differential inputs for each ADC 4 internal inputs: - Integrated Temperature Sensor - DAC Output - VCC voltage divided by 10 - Bandgap voltage Software selectable gain of 2, 4, 8, 16, 32 or 64 Software selectable resolution of 8- or 12-bit. Internal or External Reference selection Event triggered conversion for accurate timing DMA transfer of conversion results Interrupt/Event on compare result Overview XMEGA A3 devices have two Analog to Digital Converters (ADC), see Figure 25-1 on page 42. The two ADC modules can be operated simultaneously, individually or synchronized. The ADC converts analog voltages to digital values. The ADC has 12-bit resolution and is capable of converting up to 2 million samples per second. The input selection is flexible, and both single-ended and differential measurements can be done. For differential measurements an optional gain stage is available to increase the dynamic range. In addition several internal signal inputs are available. The ADC can provide both signed and unsigned results. This is a pipeline ADC. A pipeline ADC consists of several consecutive stages, where each stage convert one part of the result. The pipeline design enables high sample rate at low clock speeds, and remove limitations on samples speed versus propagation delay. This also means that a new analog voltage can be sampled and a new ADC measurement started while other ADC measurements are ongoing. ADC measurements can either be started by application software or an incoming event from another peripheral in the device. Four different result registers with individual input selection (MUX selection) are provided to make it easier for the application to keep track of the data. Each result register and MUX selection pair is referred to as an ADC Channel. It is possible to use DMA to move ADC results directly to memory or peripherals when conversions are done. Both internal and external analog reference voltages can be used. An accurate internal 1.0V reference is available. An integrated temperature sensor is available and the output from this can be measured with the ADC. The output from the DAC, VCC/10 and the Bandgap voltage can also be measured by the ADC. 41 8068T-AVR-12/10 XMEGA A3 Figure 25-1. ADC overview Channel A MUX selection Channel D MUX selection Configuration Reference selection Pin inputs Channel A Register Channel B Register Pin inputs Internal inputs Channel B MUX selection Channel C MUX selection ADC Channel C Register 1-64 X Event Trigger Channel D Register Each ADC has four MUX selection registers with a corresponding result register. This means that four channels can be sampled within 1.5 s without any intervention by the application other than starting the conversion. The results will be available in the result registers. The ADC may be configured for 8- or 12-bit result, reducing the minimum conversion time (propagation delay) from 3.5 s for 12-bit to 2.5 s for 8-bit result. ADC conversion results are provided left- or right adjusted with optional `1' or `0' padding. This eases calculation when the result is represented as a signed integer (signed 16-bit number). PORTA and PORTB each has one ADC. Notation of these peripherals are ADCA and ADCB, respectively. 42 8068T-AVR-12/10 XMEGA A3 26. DAC - 12-bit Digital to Analog Converter 26.1 Features * * * * * * * * 26.2 One DAC with 12-bit resolution Up to 1 Msps conversion rate for each DAC Flexible conversion range Multiple trigger sources 1 continuous output or 2 Sample and Hold (S/H) outputs for each DAC Built-in offset and gain calibration High drive capabilities Low Power Mode Overview The XMEGA A3 features one two-channel, 12-bit, 1 Msps DACs with built-in offset and gain calibration, see Figure 26-1 on page 43. A DAC converts a digital value into an analog signal. The DAC may use an internal 1.0 voltage as the upper limit for conversion, but it is also possible to use the supply voltage or any applied voltage in-between. The external reference input is shared with the ADC reference input. Figure 26-1. DAC overview Configuration Reference selection Channel A Register Channel A DAC Channel B Channel B Register Event Trigger The DAC has one continuous output with high drive capabilities for both resistive and capacitive loads. It is also possible to split the continuous time channel into two Sample and Hold (S/H) channels, each with separate data conversion registers. A DAC conversion may be started from the application software by writing the data conversion registers. The DAC can also be configured to do conversions triggered by the Event System to have regular timing, independent of the application software. DMA may be used for transferring data from memory locations to DAC data registers. The DAC has a built-in calibration system to reduce offset and gain error when loading with a calibration value from software. PORTB each has one DAC. Notation of this peripheral is DACB. 43 8068T-AVR-12/10 XMEGA A3 27. AC - Analog Comparator 27.1 Features * Four Analog Comparators * Selectable Power vs. Speed * Selectable hysteresis - 0, 20 mV, 50 mV * Analog Comparator output available on pin * Flexible Input Selection - All pins on the port - Output from the DAC - Bandgap reference voltage. - Voltage scaler that can perform a 64-level scaling of the internal VCC voltage. * Interrupt and event generation on - Rising edge - Falling edge - Toggle * Window function interrupt and event generation on - Signal above window - Signal inside window - Signal below window 27.2 Overview XMEGA A3 features four Analog Comparators (AC). An Analog Comparator compares two voltages, and the output indicates which input is largest. The Analog Comparator may be configured to give interrupt requests and/or events upon several different combinations of input change. Both hysteresis and propagation delays may be adjusted in order to find the optimal operation for each application. A wide range of input selection is available, both external pins and several internal signals can be used. The Analog Comparators are always grouped in pairs (AC0 and AC1) on each analog port. They have identical behavior but separate control registers. Optionally, the state of the comparator is directly available on a pin. PORTA and PORTB each has one AC pair. Notations are ACA and ACB, respectively. 44 8068T-AVR-12/10 XMEGA A3 Figure 27-1. Analog comparator overview Pin inputs Internal inputs + Pin 0 output AC0 Pin inputs - Internal inputs VCC scaled Interrupt sensitivity control Pin inputs Interrupts Events Internal inputs + AC1 Pin inputs - Internal inputs VCC scaled 45 8068T-AVR-12/10 XMEGA A3 27.3 Input Selection The Analog comparators have a very flexible input selection and the two comparators grouped in a pair may be used to realize a window function. One pair of analog comparators is shown in Figure 27-1 on page 45. * Input selection from pin - Pin 0, 1, 2, 3, 4, 5, 6 selectable to positive input of analog comparator - Pin 0, 1, 3, 5, 7 selectable to negative input of analog comparator * Internal signals available on positive analog comparator inputs - Output from 12-bit DAC * Internal signals available on negative analog comparator inputs - 64-level scaler of the VCC, available on negative analog comparator input - Bandgap voltage reference * Output from 12-bit DAC 27.4 Window Function The window function is realized by connecting the external inputs of the two analog comparators in a pair as shown in Figure 27-2. Figure 27-2. Analog comparator window function + AC0 Upper limit of window Interrupt sensitivity control Input signal Interrupts Events + AC1 Lower limit of window - 46 8068T-AVR-12/10 XMEGA A3 28. OCD - On-chip Debug 28.1 Features * Complete Program Flow Control - Go, Stop, Reset, Step into, Step over, Step out, Run-to-Cursor Debugging on C and high-level language source code level Debugging on Assembler and disassembler level 1 dedicated program address or source level breakpoint for AVR Studio / debugger 4 Hardware Breakpoints Unlimited Number of User Program Breakpoints Unlimited Number of User Data Breakpoints, with break on: - Data location read, write or both read and write - Data location content equal or not equal to a value - Data location content is greater or less than a value - Data location content is within or outside a range - Bits of a data location are equal or not equal to a value * Non-Intrusive Operation - No hardware or software resources in the device are used * High Speed Operation - No limitation on debug/programming clock frequency versus system clock frequency * * * * * * 28.2 Overview The XMEGA A3 has a powerful On-Chip Debug (OCD) system that - in combination with Atmel's development tools - provides all the necessary functions to debug an application. It has support for program and data breakpoints, and can debug an application from C and high level language source code level, as well as assembler and disassembler level. It has full Non-Intrusive Operation and no hardware or software resources in the device are used. The ODC system is accessed through an external debugging tool which connects to the JTAG or PDI physical interfaces. Refer to "Program and Debug Interfaces" on page 48. 47 8068T-AVR-12/10 XMEGA A3 29. Program and Debug Interfaces 29.1 Features * * * * * 29.2 PDI - Program and Debug Interface (Atmel proprietary 2-pin interface) JTAG Interface (IEEE std. 1149.1 compliant) Boundary-scan capabilities according to the IEEE Std. 1149.1 (JTAG) Access to the OCD system Programming of Flash, EEPROM, Fuses and Lock Bits Overview The programming and debug facilities are accessed through the JTAG and PDI physical interfaces. The PDI physical interface uses one dedicated pin together with the Reset pin, and no general purpose pins are used. JTAG uses four general purpose pins on PORTB. The PDI is an Atmel proprietary protocol for communication between the microcontroller and Atmel's or third party development tools. 29.3 IEEE 1149.1 (JTAG) Boundary-scan The JTAG physical layer handles the basic low-level serial communication over four I/O lines named TMS, TCK, TDI, and TDO. It complies to the IEEE Std. 1149.1 for test access port and boundary scan. 29.3.1 Boundary-scan Order Table 30-8 on page 53 shows the Scan order between TDI and TDO when the Boundary-scan chain is selected as data path. Bit 0 is the LSB; the first bit scanned in, and the first bit scanned out. The scan order follows the pin-out order. Bit 4, 5, 6 and 7 of Port B is not in the scan chain, since these pins constitute the TAP pins when the JTAG is enabled. 29.3.2 Boundary-scan Description Language Files Boundary-scan Description Language (BSDL) files describe Boundary-scan capable devices in a standard format used by automated test-generation software. The order and function of bits in the Boundary-scan Data Register are included in this description. BSDL files are available for ATxmega256/192/128/64A3 devices. See Table 30-8 on page 53 for ATxmega256/192/128/64A3 Boundary Scan Order. 48 8068T-AVR-12/10 XMEGA A3 30. Pinout and Pin Functions The pinout of XMEGA A3 is shown in "" on page 2. In addition to general I/O functionality, each pin may have several function. This will depend on which peripheral is enabled and connected to the actual pin. Only one of the alternate pin functions can be used at time. 30.1 Alternate Pin Function Description The tables below show the notation for all pin functions available and describe its function. 30.1.1 30.1.2 30.1.3 30.1.4 Operation/Power Supply VCC Digital supply voltage AVCC Analog supply voltage GND Ground Port Interrupt functions SYNC Port pin with full synchronous and limited asynchronous interrupt function ASYNC Port pin with full synchronous and full asynchronous interrupt function Analog functions ACn Analog Comparator input pin n AC0OUT Analog Comparator 0 Output ADCn Analog to Digital Converter input pin n DACn Digital to Analog Converter output pin n AREF Analog Reference input pin Timer/Counter and AWEX functions OCnx Output Compare Channel x for Timer/Counter n OCnx Inverted Output Compare Channel x for Timer/Counter n OCnxLS Output Compare Channel x Low Side for Timer/Counter n OCnxHS Output Compare Channel x High Side for Timer/Counter n 49 8068T-AVR-12/10 XMEGA A3 30.1.5 30.1.6 30.1.7 Communication functions SCL Serial Clock for TWI SDA Serial Data for TWI SCLIN Serial Clock In for TWI when external driver interface is enabled SCLOUT Serial Clock Out for TWI when external driver interface is enabled SDAIN Serial Data In for TWI when external driver interface is enabled SDAOUT Serial Data Out for TWI when external driver interface is enabled XCKn Transfer Clock for USART n RXDn Receiver Data for USART n TXDn Transmitter Data for USART n SS Slave Select for SPI MOSI Master Out Slave In for SPI MISO Master In Slave Out for SPI SCK Serial Clock for SPI Oscillators, Clock and Event TOSCn Timer Oscillator pin n XTALn Input/Output for inverting Oscillator pin n CLKOUT Peripheral Clock Output EVOUT Event Channel 0 Output Debug/System functions RESET Reset pin PDI_CLK Program and Debug Interface Clock pin PDI_DATA Program and Debug Interface Data pin TCK JTAG Test Clock TDI JTAG Test Data In TDO JTAG Test Data Out TMS JTAG Test Mode Select 50 8068T-AVR-12/10 XMEGA A3 30.2 Alternate Pin Functions The tables below show the main and alternate pin functions for all pins on each port. They also show which peripheral that makes use of or enables the alternate pin function. Table 30-1. PORT A PIN # Port A - Alternate functions INTERRUPT ADCA POS ADCA NEG ADAA GAINPOS SYNC ADC0 ADC0 ADCA GAINNEG ACA POS ACA NEG ADC0 AC0 AC0 ADC1 ADC1 AC1 AC1 ADC2 ADC2 AC2 GND 60 AVCC 61 PA0 62 PA1 63 SYNC ADC1 PA2 64 SYNC/ASYNC ADC2 PA3 1 SYNC ADC3 ADC3 PA4 2 SYNC ADC4 ADC4 ADC4 AC4 PA5 3 SYNC ADC5 ADC5 ADC5 AC5 PA6 4 SYNC ADC6 ADC6 ADC6 AC6 PA7 5 SYNC ADC7 ADC7 ADC7 Table 30-2. ADC3 AC3 REFA AREF AC3 AC5 AC7 AC0 OUT Port B - Alternate functions PIN # INTERRUPT ADCB POS ADCB NEG ADCB GAINPOS ACB POS ACB NEG PB0 6 SYNC ADC0 ADC0 ADC0 AC0 AC0 PB1 7 SYNC ADC1 ADC1 ADC1 AC1 AC1 PB2 8 SYNC/ASYNC ADC2 ADC2 ADC2 AC2 PB3 9 SYNC ADC3 ADC3 ADC3 AC3 PB4 10 SYNC ADC4 PB5 11 SYNC ADC5 ADC5 ADC5 AC5 PB6 12 SYNC ADC6 ADC6 ADC6 AC6 PB7 13 SYNC ADC7 ADC7 ADC7 GND 14 VCC 15 PORT B ACA OUT ADC4 ADCB GAINNEG ADC4 ACB OUT DACB REFB JTAG AREF DAC0 AC3 DAC1 AC4 TMS AC5 TDI TCK AC7 AC0 OUT TDO 51 8068T-AVR-12/10 XMEGA A3 Table 30-3. PORT C Port C - Alternate functions PIN # INTERRUPT TCC0 AWEXC PC0 16 SYNC OC0A OC0ALS PC1 17 SYNC OC0B OC0AHS XCK0 PC2 18 SYNC/ASYNC OC0C OC0BLS RXD0 PC3 19 SYNC OC0D OC0BHS PC4 20 SYNC OC0CLS OC1A PC5 21 SYNC OC0CHS OC1B PC6 22 SYNC PC7 23 SYNC GND 24 VCC 25 Table 30-4. PORT D TCC1 USARTC0 USARTC1 SPIC TWIC CLKOUT EVOUT SCL TXD0 SS XCK1 MOSI OC0DLS RXD1 MISO OC0DHS TXD1 SCK Port D - Alternate functions PIN # INTERRUPT TCD0 26 SYNC OC0A PD1 27 SYNC OC0B XCK0 PD2 28 SYNC/ASYNC OC0C RXD0 PD3 29 SYNC OC0D PD4 30 SYNC OC1A PD5 31 SYNC OC1B XCK1 MOSI PD6 32 SYNC RXD1 MISO PD7 33 SYNC TXD1 SCK GND 34 VCC 35 PORT E EVENTOUT SDA PD0 Table 30-5. CLOCKOUT TCD1 USARTD0 USARTD1 SPID CLOCKOUT EVENTOUT CLKOUT EVOUT TXD0 SS Port E - Alternate functions PIN # INTERRUPT TCE0 TCE1 USARTE0 USARTE1 SPIE PE0 36 SYNC OC0A PE1 37 SYNC OC0B XCK0 PE2 38 SYNC/ASYNC OC0C RXD0 PE3 39 SYNC OC0D TXD0 PE4 40 SYNC OC1A PE5 41 SYNC OC1B XCK1 MOSI PE6 42 SYNC RXD1 MISO PE7 43 SYNC TXD1 SCK GND 44 VCC 45 TWIE CLOCKOUT EVENTOUT TOSC SDA SCL SS TOSC2 CLKOUT EVOUT TOSC1 52 8068T-AVR-12/10 XMEGA A3 Table 30-6. PORT F Port F - Alternate functions PIN # INTERRUPT TCF0 PF0 46 SYNC OC0A PF1 47 SYNC OC0B XCK0 PF2 48 SYNC/ASYNC OC0C RXD0 PF3 49 SYNC OC0D TXD0 PF4 50 SYNC PF5 51 SYNC PF6 54 SYNC PF7 55 SYNC GND 52 VCC 53 Table 30-7. PORT R PIN # INTERRUPT USARTF0 Port R - Alternate functions PROGR PDI 56 PDI_DATA RESET 57 PDI_CLOCK XTAL PRO 58 SYNC XTAL2 PR1 59 SYNC XTAL1 Table 30-8. Bit Number 149 148 147 146 145 144 143 142 141 140 139 138 137 136 135 134 133 132 131 130 129 128 127 126 ATxmega256/192/128/64A3 Boundary Scan Order Signal Name PQ3.Bidir PQ3.Control PQ2.Bidir PQ2.Control PQ1.Bidir PQ1.Control PQ0.Bidir PQ0.Control PK7.Bidir PK7.Control PK6.Bidir PK6.Control PK5.Bidir PK5.Control PK4.Bidir PK4.Control PK3.Bidir PK3.Control PK2.Bidir PK2.Control PK1.Bidir PK1.Control PK0.Bidir PK0.Control Module PORT Q PORT K 53 8068T-AVR-12/10 XMEGA A3 Bit Number 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 Signal Name PJ7.Bidir PJ7.Control PJ6.Bidir PJ6.Control PJ5.Bidir PJ5.Control PJ4.Bidir PJ4.Control PJ3.Bidir PJ3.Control PJ2.Bidir PJ2.Control PJ1.Bidir PJ1.Control PJ0.Bidir PJ0.Control PH7.Bidir PH7.Control PH6.Bidir PH6.Control PH5.Bidir PH5.Control PH4.Bidir PH4.Control PH3.Bidir PH3.Control PH2.Bidir PH2.Control PH1.Bidir PH1.Control PH0.Bidir PH0.Control PF7.Bidir PF7.Control PF6.Bidir PF6.Control PF5.Bidir PF5.Control PF4.Bidir PF4.Control PF3.Bidir PF3.Control PF2.Bidir PF2.Control PF1.Bidir PF1.Control PF0.Bidir PF0.Control PE7.Bidir PE7.Control PE6.Bidir PE6.Control PE5.Bidir PE5.Control PE4.Bidir PE4.Control PE3.Bidir PE3.Control PE2.Bidir PE2.Control PE1.Bidir PE1.Control PE0.Bidir PE0.Control Module PORT J PORT H PORT F PORT E 54 8068T-AVR-12/10 XMEGA A3 Bit Number 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Signal Name PD7.Bidir PD7.Control PD6.Bidir PD6.Control PD5.Bidir PD5.Control PD4.Bidir PD4.Control PD3.Bidir PD3.Control PD2.Bidir PD2.Control PD1.Bidir PD1.Control PD0.Bidir PD0.Control PC7.Bidir PC7.Control PC6.Bidir PC6.Control PC5.Bidir PC5.Control PC4.Bidir PC4.Control PC3.Bidir PC3.Control PC2.Bidir PC2.Control PC1.Bidir PC1.Control PC0.Bidir PC0.Control PB3.Bidir PB3.Control PB2.Bidir PB2.Control PB1.Bidir PB1.Control PB0.Bidir PB0.Control PA7.Bidir PA7.Control PA6.Bidir PA6.Control PA5.Bidir PA5.Control PA4.Bidir PA4.Control PA3.Bidir PA3.Control PA2.Bidir PA2.Control PA1.Bidir PA1.Control PA0.Bidir PA0.Control PR1.Bidir PR1.Control PR0.Bidir PR0.Control RESET.Observe_Only PDI_DATA.Observe_Only Module PORT D PORT C PORT B PORT A PORT R RESET PDI Data 55 8068T-AVR-12/10 XMEGA A3 31. Peripheral Module Address Map The address maps show the base address for each peripheral and module in XMEGA A3. For complete register description and summary for each peripheral module, refer to the XMEGA A Manual. Base Address 0x0000 0x0010 0x0014 0x0018 0x001C 0x0030 0x0040 0x0048 0x0050 0x0060 0x0068 0x0070 0x0078 0x0080 0x0090 0x00A0 0x00B0 0x00C0 0x0100 0x0180 0x01C0 0x0200 0x0240 0x0320 0x0380 0x0390 0x0400 0x0480 0x04A0 0x0600 0x0620 0x0640 0x0660 0x0680 0x06A0 0x07E0 0x0800 0x0840 0x0880 0x0890 0x08A0 0x08B0 0x08C0 0x08F8 0x0900 0x0940 0x0990 0x09A0 0x09B0 0x09C0 0x0A00 0x0A40 0x0A80 0x0A90 0x0AA0 0x0AB0 0x0AC0 0x0B00 0x0B90 0x0BA0 Name Description GPIO VPORT0 VPORT1 VPORT2 VPORT3 CPU CLK SLEEP OSC DFLLRC32M DFLLRC2M PR RST WDT MCU PMIC PORTCFG AES DMA EVSYS NVM ADCA ADCB DACB ACA ACB RTC TWIC TWIE PORTA PORTB PORTC PORTD PORTE PORTF PORTR TCC0 TCC1 AWEXC HIRESC USARTC0 USARTC1 SPIC IRCOM TCD0 TCD1 HIRESD USARTD0 USARTD1 SPID TCE0 TCE1 AWEXE HIRESE USARTE0 USARTE1 SPIE TCF0 HIRESF USARTF0 General Purpose IO Registers Virtual Port 0 Virtual Port 1 Virtual Port 2 Virtual Port 2 CPU Clock Control Sleep Controller Oscillator Control DFLL for the 32 MHz Internal RC Oscillator DFLL for the 2 MHz RC Oscillator Power Reduction Reset Controller Watch-Dog Timer MCU Control Programmable MUltilevel Interrupt Controller Port Configuration AES Module DMA Controller Event System Non Volatile Memory (NVM) Controller Analog to Digital Converter on port A Analog to Digital Converter on port B Digital to Analog Converter on port B Analog Comparator pair on port A Analog Comparator pair on port B Real Time Counter Two Wire Interface on port C Two Wire Interfaceon port E Port A Port B Port C Port D Port E Port F Port R Timer/Counter 0 on port C Timer/Counter 1 on port C Advanced Waveform Extension on port C High Resolution Extension on port C USART 0 on port C USART 1 on port C Serial Peripheral Interface on port C Infrared Communication Module Timer/Counter 0 on port D Timer/Counter 1 on port D High Resolution Extension on port D USART 0 on port D USART 1 on port D Serial Peripheral Interface on port D Timer/Counter 0 on port E Timer/Counter 1 on port E Advanced Waveform Extensionon port E High Resolution Extension on port E USART 0 on port E USART 1 on oirt E Serial Peripheral Interface on port E Timer/Counter 0 on port F High Resolution Extension on port F USART 0 on port F 56 8068T-AVR-12/10 XMEGA A3 32. Instruction Set Summary Mnemonics Operands Description Operation Flags #Clocks Arithmetic and Logic Instructions Add without Carry Rd Rd + Rr Z,C,N,V,S,H 1 Rd, Rr Add with Carry Rd Rd + Rr + C Z,C,N,V,S,H 1 Rd, K Add Immediate to Word Rd Rd + 1:Rd + K Z,C,N,V,S 2 SUB Rd, Rr Subtract without Carry Rd Rd - Rr Z,C,N,V,S,H 1 SUBI Rd, K Subtract Immediate Rd Rd - K Z,C,N,V,S,H 1 SBC Rd, Rr Subtract with Carry Rd Rd - Rr - C Z,C,N,V,S,H 1 SBCI Rd, K Subtract Immediate with Carry Rd Rd - K - C Z,C,N,V,S,H 1 SBIW Rd, K Subtract Immediate from Word Rd + 1:Rd Rd + 1:Rd - K Z,C,N,V,S 2 ADD Rd, Rr ADC ADIW AND Rd, Rr Logical AND Rd Rd * Rr Z,N,V,S 1 ANDI Rd, K Logical AND with Immediate Rd Rd * K Z,N,V,S 1 OR Rd, Rr Logical OR Rd Rd v Rr Z,N,V,S 1 ORI Rd, K Logical OR with Immediate Rd Rd v K Z,N,V,S 1 EOR Rd, Rr Exclusive OR Rd Rd Rr Z,N,V,S 1 COM Rd One's Complement Rd $FF - Rd Z,C,N,V,S 1 NEG Rd Two's Complement Rd $00 - Rd Z,C,N,V,S,H 1 SBR Rd,K Set Bit(s) in Register Rd Rd v K Z,N,V,S 1 CBR Rd,K Clear Bit(s) in Register Rd Rd * ($FFh - K) Z,N,V,S 1 INC Rd Increment Rd Rd + 1 Z,N,V,S 1 DEC Rd Decrement Rd Rd - 1 Z,N,V,S 1 TST Rd Test for Zero or Minus Rd Rd * Rd Z,N,V,S 1 CLR Rd Clear Register Rd Rd Rd Z,N,V,S 1 SER Rd Set Register Rd $FF None 1 MUL Rd,Rr Multiply Unsigned R1:R0 Rd x Rr (UU) Z,C 2 MULS Rd,Rr Multiply Signed R1:R0 Rd x Rr (SS) Z,C 2 MULSU Rd,Rr Multiply Signed with Unsigned R1:R0 Rd x Rr (SU) Z,C 2 FMUL Rd,Rr Fractional Multiply Unsigned R1:R0 Rd x Rr<<1 (UU) Z,C 2 FMULS Rd,Rr Fractional Multiply Signed R1:R0 Rd x Rr<<1 (SS) Z,C 2 FMULSU Rd,Rr Fractional Multiply Signed with Unsigned R1:R0 Rd x Rr<<1 (SU) Z,C 2 DES K Data Encryption if (H = 0) then R15:R0 else if (H = 1) then R15:R0 Encrypt(R15:R0, K) Decrypt(R15:R0, K) PC PC + k + 1 None 2 1/2 Branch Instructions RJMP k Relative Jump IJMP Indirect Jump to (Z) PC(15:0) PC(21:16) Z, 0 None 2 EIJMP Extended Indirect Jump to (Z) PC(15:0) PC(21:16) Z, EIND None 2 JMP k Jump PC k None 3 RCALL k Relative Call Subroutine PC PC + k + 1 None 2 / 3(1) ICALL Indirect Call to (Z) PC(15:0) PC(21:16) Z, 0 None 2 / 3(1) EICALL Extended Indirect Call to (Z) PC(15:0) PC(21:16) Z, EIND None 3(1) 57 8068T-AVR-12/10 XMEGA A3 Mnemonics Operands Description CALL k call Subroutine PC RET Subroutine Return PC RETI Interrupt Return CPSE Rd,Rr Compare, Skip if Equal CP Rd,Rr Compare CPC Rd,Rr Compare with Carry CPI Rd,K Compare with Immediate Operation Flags #Clocks k None 3 / 4(1) STACK None 4 / 5(1) PC STACK I 4 / 5(1) if (Rd = Rr) PC PC + 2 or 3 None 1/2/3 Rd - Rr Z,C,N,V,S,H 1 Rd - Rr - C Z,C,N,V,S,H 1 Rd - K Z,C,N,V,S,H 1 SBRC Rr, b Skip if Bit in Register Cleared if (Rr(b) = 0) PC PC + 2 or 3 None 1/2/3 SBRS Rr, b Skip if Bit in Register Set if (Rr(b) = 1) PC PC + 2 or 3 None 1/2/3 SBIC A, b Skip if Bit in I/O Register Cleared if (I/O(A,b) = 0) PC PC + 2 or 3 None 2/3/4 SBIS A, b Skip if Bit in I/O Register Set If (I/O(A,b) =1) PC PC + 2 or 3 None 2/3/4 BRBS s, k Branch if Status Flag Set if (SREG(s) = 1) then PC PC + k + 1 None 1/2 BRBC s, k Branch if Status Flag Cleared if (SREG(s) = 0) then PC PC + k + 1 None 1/2 BREQ k Branch if Equal if (Z = 1) then PC PC + k + 1 None 1/2 BRNE k Branch if Not Equal if (Z = 0) then PC PC + k + 1 None 1/2 BRCS k Branch if Carry Set if (C = 1) then PC PC + k + 1 None 1/2 BRCC k Branch if Carry Cleared if (C = 0) then PC PC + k + 1 None 1/2 BRSH k Branch if Same or Higher if (C = 0) then PC PC + k + 1 None 1/2 BRLO k Branch if Lower if (C = 1) then PC PC + k + 1 None 1/2 BRMI k Branch if Minus if (N = 1) then PC PC + k + 1 None 1/2 BRPL k Branch if Plus if (N = 0) then PC PC + k + 1 None 1/2 BRGE k Branch if Greater or Equal, Signed if (N V= 0) then PC PC + k + 1 None 1/2 BRLT k Branch if Less Than, Signed if (N V= 1) then PC PC + k + 1 None 1/2 BRHS k Branch if Half Carry Flag Set if (H = 1) then PC PC + k + 1 None 1/2 BRHC k Branch if Half Carry Flag Cleared if (H = 0) then PC PC + k + 1 None 1/2 BRTS k Branch if T Flag Set if (T = 1) then PC PC + k + 1 None 1/2 BRTC k Branch if T Flag Cleared if (T = 0) then PC PC + k + 1 None 1/2 BRVS k Branch if Overflow Flag is Set if (V = 1) then PC PC + k + 1 None 1/2 BRVC k Branch if Overflow Flag is Cleared if (V = 0) then PC PC + k + 1 None 1/2 BRIE k Branch if Interrupt Enabled if (I = 1) then PC PC + k + 1 None 1/2 BRID k Branch if Interrupt Disabled if (I = 0) then PC PC + k + 1 None 1/2 MOV Rd, Rr Copy Register Rd Rr None 1 MOVW Rd, Rr Copy Register Pair Rd+1:Rd Rr+1:Rr None 1 LDI Rd, K Load Immediate Rd K None 1 LDS Rd, k Load Direct from data space Rd (k) None 2(1)(2) LD Rd, X Load Indirect Rd (X) None 1(1)(2) LD Rd, X+ Load Indirect and Post-Increment Rd X (X) X+1 None 1(1)(2) LD Rd, -X Load Indirect and Pre-Decrement X X - 1, Rd (X) X-1 (X) None 2(1)(2) LD Rd, Y Load Indirect Rd (Y) (Y) None 1(1)(2) LD Rd, Y+ Load Indirect and Post-Increment Rd Y (Y) Y+1 None 1(1)(2) Data Transfer Instructions 58 8068T-AVR-12/10 XMEGA A3 Mnemonics Operands Description Flags #Clocks LD Rd, -Y Load Indirect and Pre-Decrement Y Rd Y-1 (Y) None 2(1)(2) LDD Rd, Y+q Load Indirect with Displacement Rd (Y + q) None 2(1)(2) LD Rd, Z Load Indirect Rd (Z) None 1(1)(2) LD Rd, Z+ Load Indirect and Post-Increment Rd Z (Z), Z+1 None 1(1)(2) LD Rd, -Z Load Indirect and Pre-Decrement Z Rd Z - 1, (Z) None 2(1)(2) LDD Rd, Z+q Load Indirect with Displacement Rd (Z + q) None 2(1)(2) STS k, Rr Store Direct to Data Space (k) Rd None 2(1) ST X, Rr Store Indirect (X) Rr None 1(1) ST X+, Rr Store Indirect and Post-Increment (X) X Rr, X+1 None 1(1) ST -X, Rr Store Indirect and Pre-Decrement X (X) X - 1, Rr None 2(1) ST Y, Rr Store Indirect (Y) Rr None 1(1) ST Y+, Rr Store Indirect and Post-Increment (Y) Y Rr, Y+1 None 1(1) ST -Y, Rr Store Indirect and Pre-Decrement Y (Y) Y - 1, Rr None 2(1) STD Y+q, Rr Store Indirect with Displacement (Y + q) Rr None 2(1) ST Z, Rr Store Indirect (Z) Rr None 1(1) ST Z+, Rr Store Indirect and Post-Increment (Z) Z Rr Z+1 None 1(1) ST -Z, Rr Store Indirect and Pre-Decrement Z Z-1 None 2(1) STD Z+q,Rr Store Indirect with Displacement (Z + q) Rr None 2(1) Load Program Memory R0 (Z) None 3 LPM Operation LPM Rd, Z Load Program Memory Rd (Z) None 3 LPM Rd, Z+ Load Program Memory and Post-Increment Rd Z (Z), Z+1 None 3 Extended Load Program Memory R0 (RAMPZ:Z) None 3 ELPM ELPM Rd, Z Extended Load Program Memory Rd (RAMPZ:Z) None 3 ELPM Rd, Z+ Extended Load Program Memory and PostIncrement Rd Z (RAMPZ:Z), Z+1 None 3 Store Program Memory (RAMPZ:Z) R1:R0 None - (RAMPZ:Z) Z R1:R0, Z+2 None - Rd I/O(A) None 1 I/O(A) Rr None 1 STACK Rr None 1(1) Rd STACK None 2(1) Rd(n+1) Rd(0) C Rd(n), 0, Rd(7) Z,C,N,V,H 1 Rd(n) Rd(7) C Rd(n+1), 0, Rd(0) Z,C,N,V 1 SPM SPM Z+ Store Program Memory and Post-Increment by 2 IN Rd, A In From I/O Location OUT A, Rr Out To I/O Location PUSH Rr Push Register on Stack POP Rd Pop Register from Stack Bit and Bit-test Instructions LSL Rd Logical Shift Left LSR Rd Logical Shift Right 59 8068T-AVR-12/10 XMEGA A3 Mnemonics Operands Description Operation ROL Rd Rotate Left Through Carry ROR Rd ASR Flags #Clocks Rd(0) Rd(n+1) C C, Rd(n), Rd(7) Z,C,N,V,H 1 Rotate Right Through Carry Rd(7) Rd(n) C C, Rd(n+1), Rd(0) Z,C,N,V 1 Rd Arithmetic Shift Right Rd(n) Rd(n+1), n=0..6 Z,C,N,V 1 SWAP Rd Swap Nibbles Rd(3..0) Rd(7..4) None 1 BSET s Flag Set SREG(s) 1 SREG(s) 1 BCLR s Flag Clear SREG(s) 0 SREG(s) 1 SBI A, b Set Bit in I/O Register I/O(A, b) 1 None 1 CBI A, b Clear Bit in I/O Register I/O(A, b) 0 None 1 BST Rr, b Bit Store from Register to T T Rr(b) T 1 BLD Rd, b Bit load from T to Register Rd(b) T None 1 SEC Set Carry C 1 C 1 CLC Clear Carry C 0 C 1 SEN Set Negative Flag N 1 N 1 CLN Clear Negative Flag N 0 N 1 SEZ Set Zero Flag Z 1 Z 1 CLZ Clear Zero Flag Z 0 Z 1 SEI Global Interrupt Enable I 1 I 1 CLI Global Interrupt Disable I 0 I 1 SES Set Signed Test Flag S 1 S 1 CLS Clear Signed Test Flag S 0 S 1 SEV Set Two's Complement Overflow V 1 V 1 CLV Clear Two's Complement Overflow V 0 V 1 SET Set T in SREG T 1 T 1 CLT Clear T in SREG T 0 T 1 SEH Set Half Carry Flag in SREG H 1 H 1 CLH Clear Half Carry Flag in SREG H 0 H 1 MCU Control Instructions BREAK Break NOP No Operation SLEEP Sleep WDR Watchdog Reset Notes: (See specific descr. for BREAK) None 1 None 1 (see specific descr. for Sleep) None 1 (see specific descr. for WDR) None 1 1. Cycle times for Data memory accesses assume internal memory accesses, and are not valid for accesses via the external RAM interface. 2. One extra cycle must be added when accessing Internal SRAM. 60 8068T-AVR-12/10 XMEGA A3 33. Packaging information 33.1 64A PIN 1 B e PIN 1 IDENTIFIER E1 E D1 D C 0~7 A1 A2 A L COMMON DIMENSIONS (Unit of Measure = mm) Notes: 1.This package conforms to JEDEC reference MS-026, Variation AEB. 2. Dimensions D1 and E1 do not include mold protrusion. Allowable protrusion is 0.25 mm per side. Dimensions D1 and E1 are maximum plastic body size dimensions including mold mismatch. 3. Lead coplanarity is 0.10 mm maximum. SYMBOL MIN NOM MAX A - - 1.20 A1 0.05 - 0.15 A2 0.95 1.00 1.05 D 15.75 16.00 16.25 D1 13.90 14.00 14.10 E 15.75 16.00 16.25 E1 13.90 14.00 14.10 B 0.30 - 0.45 C 0.09 - 0.20 L 0.45 - 0.75 e NOTE Note 2 Note 2 0.80 TYP 2010-10-20 R 2325 Orchard Parkway San Jose, CA 95131 TITLE 64A, 64-lead, 14 x 14 mm Body Size, 1.0 mm Body Thickness, 0.8 mm Lead Pitch, Thin Profile Plastic Quad Flat Package (TQFP) DRAWING NO. REV. 64A C 61 8068T-AVR-12/10 XMEGA A3 33.2 64M2 D Marked Pin# 1 ID E C SEATING PLANE A1 TOP VIEW A3 A K 0.08 C L Pin #1 Corner D2 1 2 3 SIDE VIEW Pin #1 Triangle Option A COMMON DIMENSIONS (Unit of Measure = mm) E2 Option B Pin #1 Chamfer (C 0.30) SYMBOL MIN NOM MAX A 0.80 0.90 1.00 A1 - 0.02 0.05 A3 K Option C b e Pin #1 Notch (0.20 R) BOTTOM VIEW 0.20 REF b 0.18 0.25 0.30 D 8.90 9.00 9.10 D2 7.50 7.65 7.80 E 8.90 9.00 9.10 E2 7.50 7.65 7.80 e Notes: 1. JEDEC Standard MO-220, (SAW Singulation) Fig. 1, VMMD. 2. Dimension and tolerance conform to ASMEY14.5M-1994. NOTE 0.50 BSC L 0.35 0.40 0.45 K 0.20 0.27 0.40 2010-10-20 R 2325 Orchard Parkway San Jose, CA 95131 TITLE 64M2, 64-pad, 9 x 9 x 1.0 mm Body, Lead Pitch 0.50 mm, 7.65 mm Exposed Pad, Micro Lead Frame Package (MLF) DRAWING NO. 64M2 REV. E 62 8068T-AVR-12/10 XMEGA A3 34. Electrical Characteristics All typical values are measured at T = 25C unless other temperature condition is given. All minimum and maximum values are valid across operating temperature and voltage unless other conditions are given. 34.1 Absolute Maximum Ratings* Operating Temperature.................................. -55C to +125C *NOTICE: Storage Temperature ..................................... -65C to +150C Voltage on any Pin with respect to Ground..-0.5V to VCC+0.5V Maximum Operating Voltage ............................................ 3.6V DC Current per I/O Pin ............................................... 20.0 mA Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC Current VCC and GND Pins................................ 200.0 mA 34.2 DC Characteristics Table 34-1. Symbol Current Consumption Parameter Condition Active Typ Max VCC = 1.8V 25 VCC = 3.0V 71 VCC = 1.8V 317 VCC = 3.0V 697 VCC = 1.8V 613 800 VCC = 3.0V 1340 1800 VCC = 3.0V 15.7 18 VCC = 1.8V 3.6 VCC = 3.0V 6.9 VCC = 1.8V 112 VCC = 3.0V 215 VCC = 1.8V 224 350 VCC = 3.0V 430 650 VCC = 3.0V 6.9 8 All Functions Disabled, T = 25C VCC = 3.0V 0.1 3 All Functions Disabled, T = 85C VCC = 3.0V 1.75 5 VCC = 1.8V 1 6 VCC = 3.0V 1 6 VCC = 3.0V 2.7 10 32 kHz, Ext. Clk 1 MHz, Ext. Clk 2 MHz, Ext. Clk 32 MHz, Ext. Clk Power Supply Current(1) Idle 32 kHz, Ext. Clk ICC Min 1 MHz, Ext. Clk 2 MHz, Ext. Clk 32 MHz, Ext. Clk Power-down mode ULP, WDT, Sampled BOD, T = 25C ULP, WDT, Sampled BOD, T=85C Units A mA A mA A 63 8068T-AVR-12/10 XMEGA A3 Table 34-1. Symbol Current Consumption (Continued) Parameter Condition Power-save mode RTC 1 kHz from Low Power 32 kHz TOSC, T = 25C ICC Reset Current Consumption Min Typ Max VCC = 1.8V 0.5 4 VCC = 3.0V 0.7 4 RTC from Low Power 32 kHz TOSC VCC = 3.0V 1.16 without Reset pull-up resistor current VCC = 3.0V 1300 Units A Module current consumption(2) RC32M RC32M w/DFLL 460 Internal 32.768 kHz oscillator as DFLL source RC2M RC2M w/DFLL 101 Internal 32.768 kHz oscillator as DFLL source RC32K PLL ICC 594 134 27 Multiplication factor = 10x 202 Watchdog normal mode 1 BOD Continuous mode 128 BOD Sampled mode 1 Internal 1.00 V ref 80 Temperature reference 74 RTC with int. 32 kHz RC as source No prescaling 27 RTC with ULP as source No prescaling 1 ADC 250 kS/s - Int. 1V Ref 2.9 DAC Normal Mode 1000 kS/s, Single channel, Int. 1V Ref 1.8 DAC Low-Power Mode 1000 KS/s, Single channel, Int. 1V Ref 0.95 DAC S/H Normal Mode Int.1.1V Ref, Refresh 16CLK 2.9 DAC Low-Power Mode S/H Int. 1.1V Ref, Refresh 16CLK 1.1 AC High-speed 195 AC Low-power 103 USART Rx and Tx enabled, 9600 BAUD A mA 5.4 A DMA Timer/Counter 128 Prescaler DIV1 AES Flash/EEPROM Programming Note: 20 223 Vcc = 2V 25 Vcc = 3V 33 mA 1. All Power Reduction Registers set. 2. All parameters measured as the difference in current consumption between module enabled and disabled. All data at VCC = 3.0V, ClkSYS = 1 MHz External clock with no prescaling. 64 8068T-AVR-12/10 XMEGA A3 34.3 Operating Voltage and Frequency Table 34-2. Symbol ClkCPU Operating voltage and frequency Parameter CPU clock frequency Condition Min Typ Max VCC = 1.6V 0 12 VCC = 1.8V 0 12 VCC = 2.7V 0 32 VCC = 3.6V 0 32 Units MHz The maximum CPU clock frequency of the XMEGA A3 devices is depending on VCC. As shown in Figure 34-1 on page 65 the Frequency vs. VCC curve is linear between 1.8V < VCC < 2.7V. Figure 34-1. Maximum Frequency vs. Vcc MHz 32 Safe Operating Area 12 1.6 1.8 2.7 3.6 V 65 8068T-AVR-12/10 XMEGA A3 34.4 Flash and EEPROM Memory Characteristics Table 34-3. Symbol Endurance and Data Retention Parameter Condition Min 25C 10K 85C 10K 25C 100 55C 25 25C 80K 85C 30K 25C 100 55C 25 Typ Max Write/Erase cycles Units Cycle Flash Data retention Year Write/Erase cycles Cycle EEPROM Data retention Table 34-4. Symbol Programming time Parameter Chip Erase Flash EEPROM Notes: Year Condition Flash, EEPROM (2) and SRAM Erase Min Typ(1) Max Units 40 Page Erase 6 Page Write 6 Page WriteAutomatic Page Erase and Write 12 Page Erase 6 Page Write 6 Page WriteAutomatic Page Erase and Write 12 ms 1. Programming is timed from the internal 2 MHz oscillator. 2. EEPROM is not erased if the EESAVE fuse is programmed. 66 8068T-AVR-12/10 XMEGA A3 34.5 ADC Characteristics Table 34-5. ADC Characteristics Symbol Parameter RES Resolution INL DNL ADCclk Condition Min Typ Max Units Programmable: 8/12 8 12 12 Bits Integral Non-Linearity Differential mode, 500ksps -5 2 5 LSB Differential Non-Linearity Differential mode, 500ksps < 1 LSB Gain Error < 10 mV Offset Error < 2 mV ADC Clock frequency Max is 1/4 of Peripheral Clock Conversion rate Conversion time (propagation delay) (RES+2)/2+GAIN RES = 8 or 12, GAIN = 0, 1, 2 or 3 Sampling Time 1/2 ADCclk cycle Analog Supply Voltage VREF Reference voltage 7 kHz 2000 ksps 8 ADCclk cycles 0.25 Conversion range AVCC 5 2000 uS 0 VREF V Vcc-0.3 Vcc+0.3 V 1.0 Vcc-0.6 V Input bandwidth INT1V kHz (1) Internal 1.00V reference 1.00 V INTVCC Internal VCC/1.6 VCC/1.6 V SCALEDVCC Scaled internal VCC/10 input VCC/10 V Reference input resistance > 10 M RAREF Start-up time Internal input sampling speed Note: 12 Temp. sensor, VCC/10, Bandgap ADCclk cycles 100 ksps 1. Refer to "Bandgap Characteristics" on page 68 for more parameter details. Table 34-6. Symbol ADC Gain Stage Characteristics Parameter Gain error Condition 1 to 64 gain Noise level at input Clock rate Min Typ Max < 1 Offset error Vrms 24 Units % < 1 VREF = Int. 1V 0.12 VREF = Ext. 2V 0.06 mV 64x gain Same as ADC 1000 kHz 67 8068T-AVR-12/10 XMEGA A3 34.6 DAC Characteristics Table 34-7. Symbol DAC Characteristics Parameter Condition INL Integral Non-Linearity VCC = 1.6-3.6V DNL Differential Non-Linearity VCC = 1.6-3.6V Fclk Min VREF = Ext. ref 5 VREF = Ext. ref <1 External reference voltage 1.1 Reference input impedance Units LSB 1000 ksps AVCC-0.6 V >10 Max output voltage Rload=100k AVCC*0.98 Min output voltage Rload=100k 0.015 Offset factory calibration accuracy Continues mode, VCC=3.0V, VREF = Int 1.00V, T=85C 0.5 Gain factory calibration accuracy Max VREF= AVCC Conversion rate AREF 34.7 Typ M V LSB 2.5 Analog Comparator Characteristics Table 34-8. Symbol Analog Comparator Characteristics Parameter Condition Input Offset Voltage VCC = 1.6 - 3.6V <10 mV Input Leakage Current VCC = 1.6 - 3.6V < 1000 pA Vhys1 Hysteresis, No VCC = 1.6 - 3.6V 0 Vhys2 Hysteresis, Small VCC = 1.6 - 3.6V mode = HS 20 Vhys3 Hysteresis, Large VCC = 1.6 - 3.6V mode = HS 40 VCC = 3.0V, T= 85C mode = HS VCC = 1.6 - 3.6V mode = HS 110 VCC = 1.6 - 3.6V mode = LP 175 Voff Ilk tdelay 34.8 Propagation delay Min Typ Max Units mV 100 ns Bandgap Characteristics Table 34-9. Symbol Bandgap Voltage Characteristics Parameter Condition As reference for ADC or DAC Min Typ Max Units 1 Clk_PER + 2.5s Bandgap startup time s As input to AC or ADC 1.5 Bandgap voltage 1.1 V INT1V Internal 1.00V reference T= 85C, After calibration Variation over voltage and temperature VCC = 1.6 - 3.6V, T = -40C to 85C 0.99 1 2 1.01 % 68 8068T-AVR-12/10 XMEGA A3 34.9 Brownout Detection Characteristics Table 34-10. Brownout Detection Characteristics(1) Symbol Parameter Condition BOD level 0 falling Vcc Min Typ Max 1.62 1.63 1.7 BOD level 1 falling Vcc 1.9 BOD level 2 falling Vcc 2.17 BOD level 3 falling Vcc 2.43 BOD level 4 falling Vcc 2.68 BOD level 5 falling Vcc 2.96 BOD level 6 falling Vcc 3.22 BOD level 7 falling Vcc 3.49 Units V Hysteresis Note: BOD level 0-5 1 % 1. BOD is calibrated at 85C within BOD level 0 values, and BOD level 0 is the default level. 34.10 PAD Characteristics Table 34-11. PAD Characteristics Symbol Parameter VIH Input High Voltage VIL Input Low Voltage VOL VOH Output Low Voltage GPIO Output High Voltage GPIO Condition Min Typ Max VCC = 2.4 - 3.6V 0.7*VCC VCC+0.5 VCC = 1.6 - 2.4V 0.8*VCC VCC+0.5 VCC = 2.4 - 3.6V -0.5 0.3*VCC VCC = 1.6 - 2.4V -0.5 0.2*VCC IOH = 15 mA, VCC = 3.3V 0.4 0.76 IOH = 10 mA, VCC = 3.0V 0.3 0.64 IOH = 5 mA, VCC = 1.8V 0.2 0.46 V IOH = -8 mA, VCC = 3.3V 2.6 2.9 IOH = -6 mA, VCC = 3.0V 2.1 2.7 IOH = -2 mA, VCC = 1.8V 1.4 1.6 IIL Input Leakage Current I/O pin <0.001 1 IIH Input Leakage Current I/O pin <0.001 1 RP I/O pin Pull/Buss keeper Resistor 20 Reset pin Pull-up Resistor 20 Input hysteresis 0.5 RRST Units A k V 69 8068T-AVR-12/10 XMEGA A3 34.11 POR Characteristics Table 34-12. Power-on Reset Characteristics Symbol Parameter VPOT- POR threshold voltage falling VCC VPOT+ POR threshold voltage rising VCC Condition Min Typ VCC falls faster than 1V/ms 0.4 0.8 VCC falls at 1V/ms or slower 0.8 1.3 Max Units V 1.3 1.59 Typ Max Units 90 1000 ns 34.12 Reset Characteristics Table 34-13. Reset Characteristics Symbol Parameter Condition Min Minimum reset pulse width Reset threshold voltage VCC = 2.7 - 3.6V 0.45*VCC VCC = 1.6 - 2.7V 0.42*VCC V 34.13 Oscillator Characteristics Table 34-14. Internal 32.768 kHz Oscillator Characteristics Symbol Parameter Accuracy Condition T = 85C, VCC = 3V, After production calibration Min Typ -0.5 Max Units 0.5 % Max Units Table 34-15. Internal 2 MHz Oscillator Characteristics Symbol Parameter Accuracy DFLL Calibration step size Condition T = 85C, VCC = 3V, After production calibration Min Typ -1.5 1.5 % T = 25C, VCC = 3V 0.15 Table 34-16. Internal 32 MHz Oscillator Characteristics Symbol Parameter Accuracy DFLL Calibration stepsize Condition T = 85C, VCC = 3V, After production calibration Min Typ -1.5 Max Units 1.5 % T = 25C, VCC = 3V 0.2 Table 34-17. Internal 32 kHz, ULP Oscillator Characteristics Symbol Parameter Output frequency 32 kHz ULP OSC Condition T = 85C, VCC = 3.0V Min Typ 26 Max Units kHz 70 8068T-AVR-12/10 XMEGA A3 Table 34-18. External 32.768kHz Crystal Oscillator and TOSC characteristics Symbol SF Parameter Condition Capacitive load matched to crystal specification Safety factor ESR/R1 Recommended crystal equivalent series resistance (ESR) CIN_TOSC Input capacitance between TOSC pins Note: Min Typ Max Units 3 Crystal load capacitance 6.5pF 60 Crystal load capacitance 9.0pF 35 k Normal mode 1.7 Low power mode 2.2 pF 1. See Figure 34-2 on page 71 for definition Figure 34-2. TOSC input capacitance CL1 CL2 Device internal External TOSC1 TOSC2 32.768 KHz crystal The input capacitance between the TOSC pins is CL1 + CL2 in series as seen from the crystal when oscillating without external capacitors. Table 34-19. Device wake-up time from sleep Symbol Parameter Condition(1) Int. 32.768 kHz RC Idle Sleep, Standby and Extended Standby sleep mode Min Typ(2) Max Units 130 Int. 2 MHz RC 2 Ext. 2 MHz Clock 2 Int. 32 MHz RC 0.17 Int. 32.768 kHz RC 320 Int. 2 MHz RC 10.3 Ext. 2 MHz Clock 4.5 Int. 32 MHz RC 5.8 S Power-save and Power-down Sleep mode Notes: 1. Non-prescaled System Clock source. 2. Time from pin change on external interrupt pin to first available clock cycle. Additional interrupt response time is minimum 5 system clock source cycles. 71 8068T-AVR-12/10 XMEGA A3 35. Typical Characteristics 35.1 Active Supply Current Figure 35-1. Active Supply Current vs. Frequency fSYS = 0 - 1.0 MHz External clock, T = 25C ICC [uA] 900 800 3.3 V 700 3.0 V 600 2.7 V 500 2.2 V 400 1.8 V 300 200 100 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Frequency [MHz] Figure 35-2. Active Supply Current vs. Frequency fSYS = 1 - 32 MHz External clock, T = 25C ICC [mA] 20 18 3.3 V 16 3.0 V 14 2.7 V 12 10 8 2.2 V 6 4 1.8 V 2 0 0 4 8 12 16 20 24 28 32 Frequency [MHz] 72 8068T-AVR-12/10 XMEGA A3 Figure 35-3. Active Supply Current vs. Vcc fSYS = 1.0 MHz External Clock 85 C 25 C -40 C 1000 900 800 ICC [uA] 700 600 500 400 300 200 100 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] Figure 35-4. Active Supply Current vs. VCC fSYS = 32.768 kHz internal RC 140 -40 C 25 C 85 C 120 ICC [uA] 100 80 60 40 20 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] 73 8068T-AVR-12/10 XMEGA A3 Figure 35-5. Active Supply Current vs. Vcc fSYS = 2.0 MHz internal RC 2000 -40 C 25 C 85 C 1800 1600 ICC [uA] 1400 1200 1000 800 600 400 200 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] Figure 35-6. Active Supply Current vs. Vcc fSYS = 32 MHz internal RC prescaled to 8 MHz 8 -40 C 25 C 85 C 7 6 ICC [mA] 5 4 3 2 1 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] 74 8068T-AVR-12/10 XMEGA A3 Figure 35-7. Active Supply Current vs. Vcc fSYS = 32 MHz internal RC 25 -40 C 25 C 85 C ICC [mA] 20 15 10 5 0 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 VCC [V] 35.2 Idle Supply Current Figure 35-8. Idle Supply Current vs. Frequency fSYS = 0 - 1.0 MHz, T = 25C 250 3.3 V 3.0 V 200 ICC [uA] 2.7 V 150 2.2 V 1.8 V 100 50 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Frequency [MHz] 75 8068T-AVR-12/10 XMEGA A3 Figure 35-9. Idle Supply Current vs. Frequency fSYS = 1 - 32 MHz, T = 25C 8 3.3 V 7 3.0 V 6 2.7 V ICC [mA] 5 4 3 2.2 V 2 1.8 V 1 0 0 4 8 12 16 20 24 28 32 Frequency [MHz] Figure 35-10. Idle Supply Current vs. Vcc fSYS = 1.0 MHz External Clock 300 85 C 25 C -40 C 250 ICC [uA] 200 150 100 50 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] 76 8068T-AVR-12/10 XMEGA A3 Figure 35-11. Idle Supply Current vs. Vcc fSYS = 32.768 kHz internal RC 40 85 C -40 C 25 C 35 30 ICC [uA] 25 20 15 10 5 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] Figure 35-12. Idle Supply Current vs. Vcc fSYS = 2.0 MHz internal RC 700 -40 C 25 C 85 C 600 ICC [uA] 500 400 300 200 100 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] 77 8068T-AVR-12/10 XMEGA A3 Figure 35-13. Idle Supply Current vs. Vcc fSYS = 32 MHz internal RC prescaled to 8 MHz 3.5 -40 C 25 C 85 C 3.0 ICC [mA] 2.5 2.0 1.5 1.0 0.5 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] Figure 35-14. Idle Supply Current vs. Vcc fSYS = 32 MHz internal RC 10 -40 C 25 C 85 C ICC [mA] 8 6 4 2 0 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 VCC [V] 78 8068T-AVR-12/10 XMEGA A3 35.3 Power-down Supply Current Figure 35-15. Power-down Supply Current vs. Temperature 2 3.3 V 3.0 V 2.7 V 2.2 V 1.8 V 1.8 1.6 ICC [uA] 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature [C] Figure 35-16. Power-down Supply Current vs. Temperature With WDT and sampled BOD enabled. 3.3 V 3.0 V 2.7 V 2.2 V 1.8 V 3 2.5 ICC [uA] 2 1.5 1 0.5 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature [C] 79 8068T-AVR-12/10 XMEGA A3 35.4 Power-save Supply Current Figure 35-17. Power-save Supply Current vs. Temperature With WDT, sampled BOD and RTC from ULP enabled 3 3.3 V 3.0 V 2.7 V 1.8 V 2.2 V 2.5 ICC [uA] 2 1.5 1 0.5 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature [C] 35.5 Pin Pull-up Figure 35-18. Reset Pull-up Resistor Current vs. Reset Pin Voltage VCC = 1.8V 100 IRESET [uA] 80 60 40 20 -40 C 25 C 85 C 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 VRESET [V] 80 8068T-AVR-12/10 XMEGA A3 Figure 35-19. Reset Pull-up Resistor Current vs. Reset Pin Voltage VCC = 3.0V 160 140 IRESET [uA] 120 100 80 60 40 -40 C 25 C 85 C 20 0 0 0.5 1 1.5 2 2.5 3 VRESET [V] Figure 35-20. Reset Pull-up Resistor Current vs. Reset Pin Voltage VCC = 3.3V 180 160 140 IRESET [uA] 120 100 80 60 40 -40 C 25 C 85 C 20 0 0 0.5 1 1.5 2 2.5 3 VRESET [V] 81 8068T-AVR-12/10 XMEGA A3 35.6 Pin Output Voltage vs. Sink/Source Current Figure 35-21. I/O Pin Output Voltage vs. Source Current Vcc = 1.8V 2 -40 C 25 C 85 C 1.8 1.6 VPIN [V] 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -12 -10 -8 -6 -4 -2 0 IPIN [mA] Figure 35-22. I/O Pin Output Voltage vs. Source Current Vcc = 3.0V 3.5 -40 C 25 C 85 C 3 VPIN [V] 2.5 2 1.5 1 0.5 0 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 0 IPIN [mA] 82 8068T-AVR-12/10 XMEGA A3 Figure 35-23. I/O Pin Output Voltage vs. Source Current Vcc = 3.3V 3.5 -40 C 25 C 85 C 3 VPIN [V] 2.5 2 1.5 1 0.5 0 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 0 IPIN [mA] Figure 35-24. I/O Pin Output Voltage vs. Sink Current Vcc = 1.8V 85C 25C 1.8 1.6 1.4 VPIN [V] 1.2 -40 C 1 0.8 0.6 0.4 0.2 0 0 2 4 6 8 10 12 14 16 18 20 IPIN [mA] 83 8068T-AVR-12/10 XMEGA A3 Figure 35-25. I/O Pin Output Voltage vs. Sink Current Vcc = 3.0V 0.7 85 C 0.6 25 C -40 C VPIN [V] 0.5 0.4 0.3 0.2 0.1 0 0 2 4 6 8 10 12 14 16 18 20 IPIN [mA] Figure 35-26. I/O Pin Output Voltage vs. Sink Current Vcc = 3.3V VPIN [V] 0.7 0.6 85 C 0.5 25 C -40 C 0.4 0.3 0.2 0.1 0 0 2 4 6 8 10 12 14 16 18 20 IPIN [mA] 84 8068T-AVR-12/10 XMEGA A3 35.7 Pin Thresholds and Hysteresis Figure 35-27. I/O Pin Input Threshold Voltage vs. VCC VIH - I/O Pin Read as "1" 2.5 -40 C 25 C 85 C Vthreshold [V] 2 1.5 1 0.5 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] Figure 35-28. I/O Pin Input Threshold Voltage vs. VCC VIL - I/O Pin Read as "0" 1.8 85 C 25 C -40 C 1.6 1.4 Vthreshold [V] 1.2 1 0.8 0.6 0.4 0.2 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] 85 8068T-AVR-12/10 XMEGA A3 Figure 35-29. I/O Pin Input Hysteresis vs. VCC 0.7 0.6 Vthreshold [V] 0.5 85 C 25 C -40 C 0.4 0.3 0.2 0.1 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] Figure 35-30. Reset Input Threshold Voltage vs. VCC VIH - I/O Pin Read as "1" 1.8 -40 C 25 C 85 C 1.6 VTHRESHOLD [V] 1.4 1.2 1 0.8 0.6 0.4 0.2 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] 86 8068T-AVR-12/10 XMEGA A3 Figure 35-31. Reset Input Threshold Voltage vs. VCC VIL - I/O Pin Read as "0" 1.8 -40 C 25 C 85 C 1.6 VTHRESHOLD [V] 1.4 1.2 1 0.8 0.6 0.4 0.2 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] 35.8 Bod Thresholds Figure 35-32. BOD Thresholds vs. Temperature BOD Level = 1.6V VBOT [V] 1.67 1.66 Rising Vcc 1.65 Falling Vcc 1.64 1.63 1.62 1.61 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature [C] 87 8068T-AVR-12/10 XMEGA A3 Figure 35-33. BOD Thresholds vs. Temperature BOD Level = 2.9V 3.06 3.04 Rising Vcc 3.02 VBOT [V] 3 2.98 Falling Vcc 2.96 2.94 2.92 2.9 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature [C] 35.9 35.9.1 Oscillators and Wake-up Time Internal 32.768 kHz Oscillator Figure 35-34. Internal 32.768 kHz Oscillator Calibration Step Size T = -40 to 85C, VCC = 3V 0.80 % Step size: f [kHz] 0.65 % 0.50 % 0.35 % 0.20 % 0.05 % 0 32 64 96 128 160 192 224 256 RC32KCAL[7..0] 88 8068T-AVR-12/10 XMEGA A3 35.9.2 Internal 2 MHz Oscillator Figure 35-35. Internal 2 MHz Oscillator CALA Calibration Step Size T = -40 to 85C, VCC = 3V 0.50 % 0.40 % Step size: f [MHz] 0.30 % 0.20 % 0.10 % 0.00 % -0.10 % -0.20 % -0.30 % 0 16 32 48 64 80 96 112 128 56 64 DFLLRC2MCALA Figure 35-36. Internal 2 MHz Oscillator CALB Calibration Step Size T = -40 to 85C, VCC = 3V 3.00 % Step size: f [MHz] 2.50 % 2.00 % 1.50 % 1.00 % 0.50 % 0.00 % 0 8 16 24 32 40 48 DFLLRC2MCALB 89 8068T-AVR-12/10 XMEGA A3 35.9.3 Internal 32 MHZ Oscillator Figure 35-37. Internal 32 MHz Oscillator CALA Calibration Step Size T = -40 to 85C, VCC = 3V 0.60 % 0.50 % Step size: f [MHz] 0.40 % 0.30 % 0.20 % 0.10 % 0.00 % -0.10 % -0.20 % 0 16 32 48 64 80 96 112 128 56 64 DFLLRC32MCALA Figure 35-38. Internal 32 MHz Oscillator CALB Calibration Step Size T = -40 to 85C, VCC = 3V 3.00 % Step size: f [MHz] 2.50 % 2.00 % 1.50 % 1.00 % 0.50 % 0.00 % 0 8 16 24 32 40 48 DFLLRC32MCALB 90 8068T-AVR-12/10 XMEGA A3 35.10 Module current consumption Figure 35-39. AC current consumption vs. Vcc Low-power Mode Module current consumption [uA] 120 85 C 25 C 100 -40 C 80 60 40 20 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] Figure 35-40. Power-up current consumption vs. Vcc -40 C 25 C 85 C 700 600 ICC [uA] 500 400 300 200 100 0 0.4 0.6 0.8 1 1.2 1.4 1.6 VCC [V] 91 8068T-AVR-12/10 XMEGA A3 35.11 Reset Pulsewidth Figure 35-41. Minimum Reset Pulse Width vs. Vcc 120 100 85 C 25 C -40 C tRST [ns] 80 60 40 20 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] 35.12 PDI Speed Figure 35-42. PDI Speed vs. Vcc 35 25 C 30 fMAX [MHz] 25 20 15 10 5 0 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 VCC [V] 92 8068T-AVR-12/10 XMEGA A3 36. Errata 36.1 36.1.1 ATxmega256A3 rev. E * * * * * * * * * * * * * * * * * * * * * * * * * * Bandgap voltage input for the ACs can not be changed when used for both ACs simultaneously VCC voltage scaler for AC is non-linear ADC has increased INL error for some operating conditions ADC gain stage output range is limited to 2.4 V ADC Event on compare match non-functional Bandgap measurement with the ADC is non-functional when VCC is below 2.7V Accuracy lost on first three samples after switching input to ADC gain stage Configuration of PGM and CWCM not as described in XMEGA A Manual PWM is not restarted properly after a fault in cycle-by-cycle mode BOD will be enabled at any reset DAC is nonlinear and inaccurate when reference is above 2.4V or VCC - 0.6V DAC has increased INL or noise for some operating conditions DAC refresh may be blocked in S/H mode Conversion lost on DAC channel B in event triggered mode EEPROM page buffer always written when NVM DATA0 is written Pending full asynchronous pin change interrupts will not wake the device Pin configuration does not affect Analog Comparator Output NMI Flag for Crystal Oscillator Failure automatically cleared Crystal start-up time required after power-save even if crystal is source for RTC RTC Counter value not correctly read after sleep Pending asynchronous RTC-interrupts will not wake up device TWI Transmit collision flag not cleared on repeated start Clearing TWI Stop Interrupt Flag may lock the bus TWI START condition at bus timeout will cause transaction to be dropped TWI Data Interrupt Flag (DIF) erroneously read as set WDR instruction inside closed window will not issue reset 1. Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously If the Bandgap voltage is selected as input for one Analog Comparator (AC) and then selected/deselected as input for another AC, the first comparator will be affected for up to 1 s and could potentially give a wrong comparison result. Problem fix/Workaround If the Bandgap is required for both ACs simultaneously, configure the input selection for both ACs before enabling any of them. 2. VCC voltage scaler for AC is non-linear The 6-bit VCC voltage scaler in the Analog Comparators is non-linear. 93 8068T-AVR-12/10 XMEGA A3 Figure 36-1. Analog Comparator Voltage Scaler vs. Scalefac T = 25C 3.5 3.3 V 3 2.7 V VSCALE [V] 2.5 2 1.8 V 1.5 1 0.5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 SCALEFAC Problem fix/Workaround Use external voltage input for the analog comparator if accurate voltage levels are needed 3. ADC has increased INL error for some operating conditions Some ADC configurations or operating condition will result in increased INL error. In signed mode INL is increased to: - 6LSB for sample rates above 1Msps, and up to 8 LSB for 2Msps sample rate. - 6LSB for reference voltage below 1.1V when VCC is above 3.0V. - 20LSB for ambient temperature below 0 degree C and reference voltage below 1.3V. In unsigned mode, the INL error cannot be guaranteed, and this mode should not be used. Problem fix/Workaround None, avoid using the ADC in the above configurations in order to prevent increased INL error. Use the ADC in signed mode also for single ended measurements. 4. ADC gain stage output range is limited to 2.4 V The amplified output of the ADC gain stage will never go above 2.4 V, hence the differential input will only give correct output when below 2.4 V/gain. For the available gain settings, this gives a differential input range of: - 1x gain: 2.4 V - 2x gain: 1.2 V - 4x gain: 0.6 V - 8x gain: 300 mV - 16x gain: 150 mV - 32x gain: 75 mV - 64x gain: 38 mV 94 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround Keep the amplified voltage output from the ADC gain stage below 2.4 V in order to get a correct result, or keep ADC voltage reference below 2.4 V. 5. ADC Event on compare match non-functional ADC signalling event will be given at every conversion complete even if Interrupt mode (INTMODE) is set to BELOW or ABOVE. Problem fix/Workaround Enable and use interrupt on compare match when using the compare function. 6. Bandgap measurement with the ADC is non-functional when VCC is below 2.7V The ADC can not be used to do bandgap measurements when VCC is below 2.7V. Problem fix/Workaround None. 7. Accuracy lost on first three samples after switching input to ADC gain stage Due to memory effect in the ADC gain stage, the first three samples after changing input channel must be disregarded to achieve 12-bit accuracy. Problem fix/Workaround Run three ADC conversions and discard these results after changing input channels to ADC gain stage. 8. Configuration of PGM and CWCM not as described in XMEGA A Manual Enabling Common Waveform Channel Mode will enable Pattern generation mode (PGM), but not Common Waveform Channel Mode. Enabling Pattern Generation Mode (PGM) and not Common Waveform Channel Mode (CWCM) will enable both Pattern Generation Mode and Common Waveform Channel Mode. Problem fix/Workaround Table 36-1. Configure PWM and CWCM according to this table: PGM CWCM Description 0 0 PGM and CWCM disabled 0 1 PGM enabled 1 0 PGM and CWCM enabled 1 1 PGM enabled 9. PWM is not restarted properly after a fault in cycle-by-cycle mode When the AWeX fault restore mode is set to cycle-by-cycle, the waveform output will not return to normal operation at first update after fault condition is no longer present. Problem fix/Workaround Do a write to any AWeX I/O register to re-enable the output. 10. BOD will be enabled after any reset If any reset source goes active, the BOD will be enabled and keep the device in reset if the VCC voltage is below the programmed BOD level. During Power-On Reset, reset will not be released until VCC is above the programmed BOD level even if the BOD is disabled. 95 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround Do not set the BOD level higher than VCC even if the BOD is not used. 11. DAC is nonlinear and inaccurate when reference is above 2.4V or VCC - 0.6V Using the DAC with a reference voltage above 2.4V or VCC - 0.6V will give inaccurate output when converting codes that give below 0.75V output: - 10 LSB for continuous mode - 200 LSB for Sample and Hold mode Problem fix/Workaround None. 12. DAC has increased INL or noise for some operating conditions Some DAC configurations or operating condition will result in increased output error. - Continous mode: 5 LSB - Sample and hold mode: 15 LSB - Sample and hold mode for reference above 2.0v: up to 100 LSB Problem fix/Workaround None. 13. DAC refresh may be blocked in S/H mode If the DAC is running in Sample and Hold (S/H) mode and conversion for one channel is done at maximum rate (i.e. the DAC is always busy doing conversion for this channel), this will block refresh signals to the second channel. Problem fix/Workaround When using the DAC in S/H mode, ensure that none of the channels is running at maximum conversion rate, or ensure that the conversion rate of both channels is high enough to not require refresh. 14. Conversion lost on DAC channel B in event triggered mode If during dual channel operation channel 1 is set in auto trigged conversion mode, channel 1 conversions are occasionally lost. This means that not all data-values written to the Channel 1 data register are converted. Problem fix/Workaround Keep the DAC conversion interval in the range 000-001 (1 and 3 CLK), and limit the Peripheral clock frequency so the conversion internal never is shorter than 1.5 s. 15. EEPROM page buffer always written when NVM DATA0 is written If the EEPROM is memory mapped, writing to NVM DATA0 will corrupt data in the EEPROM page buffer. Problem fix/Workaround Before writing to NVM DATA0, for example when doing software CRC or flash page buffer write, check if EEPROM page buffer active loading flag (EELOAD) is set. Do not write NVM DATA0 when EELOAD is set. 96 8068T-AVR-12/10 XMEGA A3 16. Pending full asynchronous pin change interrupts will not wake the device Any full asynchronous pin-change Interrupt from pin 2, on any port, that is pending when the sleep instruction is executed, will be ignored until the device is woken from another source or the source triggers again. This applies when entering all sleep modes where the System Clock is stopped. Problem fix/Workaround None. 17. Pin configuration does not affect Analog Comparator output The Output/Pull and inverted pin configuration does not affect the Analog Comparator output. Problem fix/Workaround None for Output/Pull configuration. For inverted I/O, configure the Analog Comparator to give an inverted result (i.e. connect positive input to the negative AC input and vice versa), or use and external inverter to change polarity of Analog Comparator output. 18. NMI Flag for Crystal Oscillator Failure automatically cleared NMI flag for Crystal Oscillator Failure (XOSCFDIF) will be automatically cleared when executing the NMI interrupt handler. Problem fix/Workaround This device revision has only one NMI interrupt source, so checking the interrupt source in software is not required. 19. Crystal start-up time required after power-save even if crystal is source for RTC Even if 32.768 kHz crystal is used for RTC during sleep, the clock from the crystal will not be ready for the system before the specified start-up time. See "XOSCSEL[3:0]: Crystal Oscillator Selection" in XMEGA A Manual. If BOD is used in active mode, the BOD will be on during this period (0.5s). Problem fix/Workaround If faster start-up is required, go to sleep with internal oscillator as system clock. 20. RTC Counter value not correctly read after sleep If the RTC is set to wake up the device on RTC Overflow and bit 0 of RTC CNT is identical to bit 0 of RTC PER as the device is entering sleep, the value in the RTC count register can not be read correctly within the first prescaled RTC clock cycle after wakeup. The value read will be the same as the value in the register when entering sleep. The same applies if RTC Compare Match is used as wake-up source. Problem fix/Workaround Wait at least one prescaled RTC clock cycle before reading the RTC CNT value. 21. Pending asynchronous RTC-interrupts will not wake up device Asynchronous Interrupts from the Real-Time-Counter that is pending when the sleep instruction is executed, will be ignored until the device is woken from another source or the source triggers again. Problem fix/Workaround None. 97 8068T-AVR-12/10 XMEGA A3 22. TWI Transmit collision flag not cleared on repeated start The TWI transmit collision flag should be automatically cleared on start and repeated start, but is only cleared on start. Problem fix/Workaround Clear the flag in software after address interrupt. 23. Clearing TWI Stop Interrupt Flag may lock the bus If software clears the STOP Interrupt Flag (APIF) on the same Peripheral Clock cycle as the hardware sets this flag due to a new address received, CLKHOLD is not cleared and the SCL line is not released. This will lock the bus. Problem fix/Workaround Check if the bus state is IDLE. If this is the case, it is safe to clear APIF. If the bus state is not IDLE, wait for the SCL pin to be low before clearing APIF. Code: /* Only clear the interrupt flag if within a "safe zone". */ while ( /* Bus not IDLE: */ ((COMMS_TWI.MASTER.STATUS & TWI_MASTER_BUSSTATE_gm) != TWI_MASTER_BUSSTATE_IDLE_gc)) && /* SCL not held by slave: */ !(COMMS_TWI.SLAVE.STATUS & TWI_SLAVE_CLKHOLD_bm) ) { /* Ensure that the SCL line is low */ if ( !(COMMS_PORT.IN & PIN1_bm) ) if ( !(COMMS_PORT.IN & PIN1_bm) ) break; } /* Check for an pending address match interrupt */ if ( !(COMMS_TWI.SLAVE.STATUS & TWI_SLAVE_CLKHOLD_bm) ) { /* Safely clear interrupt flag */ COMMS_TWI.SLAVE.STATUS |= (uint8_t)TWI_SLAVE_APIF_bm; } 24. TWI START condition at bus timeout will cause transaction to be dropped If Bus Timeout is enabled and a timeout occurs on the same Peripheral Clock cycle as a START is detected, the transaction will be dropped. Problem fix/Workaround None. 25. TWI Data Interrupt Flag erroneously read as set When issuing the TWI slave response command CMD=0b11, it takes 1 Peripheral Clock cycle to clear the data interrupt flag (DIF). A read of DIF directly after issuing the command will show the DIF still set. Problem fix/Workaround Add one NOP instruction before checking DIF. 98 8068T-AVR-12/10 XMEGA A3 26. WDR instruction inside closed window will not issue reset When a WDR instruction is execute within one ULP clock cycle after updating the window control register, the counter can be cleared without giving a system reset. Problem fix/Workaround Wait at least one ULP clock cycle before executing a WDR instruction. 99 8068T-AVR-12/10 XMEGA A3 36.1.2 rev. B * * * * * * * * * * * * * * * * * * * * * * * * * * * Bandgap voltage input for the ACs can not be changed when used for both ACs simultaneously VCC voltage scaler for AC is non-linear ADC has increased INL error for some operating conditions ADC gain stage output range is limited to 2.4 V ADC Event on compare match non-functional Bandgap measurement with the ADC is non-functional when VCC is below 2.7V Accuracy lost on first three samples after switching input to ADC gain stage Configuration of PGM and CWCM not as described in XMEGA A Manual PWM is not restarted properly after a fault in cycle-by-cycle mode BOD will be enabled at any reset DAC is nonlinear and inaccurate when reference is above 2.4V or VCC - 0.6V DAC has increased INL or noise for some operating conditions DAC refresh may be blocked in S/H mode Conversion lost on DAC channel B in event triggered mode EEPROM page buffer always written when NVM DATA0 is written Pending full asynchronous pin change interrupts will not wake the device Pin configuration does not affect Analog Comparator Output NMI Flag for Crystal Oscillator Failure automatically cleared Writing EEPROM or Flash while reading any of them will not work Crystal start-up time required after power-save even if crystal is source for RTC RTC Counter value not correctly read after sleep Pending asynchronous RTC-interrupts will not wake up device TWI Transmit collision flag not cleared on repeated start Clearing TWI Stop Interrupt Flag may lock the bus TWI START condition at bus timeout will cause transaction to be dropped TWI Data Interrupt Flag (DIF) erroneously read as set WDR instruction inside closed window will not issue reset 1. Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously If the Bandgap voltage is selected as input for one Analog Comparator (AC) and then selected/deselected as input for another AC, the first comparator will be affected for up to 1 s and could potentially give a wrong comparison result. Problem fix/Workaround If the Bandgap is required for both ACs simultaneously, configure the input selection for both ACs before enabling any of them. 2. VCC voltage scaler for AC is non-linear The 6-bit VCC voltage scaler in the Analog Comparators is non-linear. 100 8068T-AVR-12/10 XMEGA A3 Figure 36-2. Analog Comparator Voltage Scaler vs. Scalefac T = 25C 3.5 3.3 V 3 2.7 V VSCALE [V] 2.5 2 1.8 V 1.5 1 0.5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 SCALEFAC Problem fix/Workaround Use external voltage input for the analog comparator if accurate voltage levels are needed 3. ADC has increased INL error for some operating conditions Some ADC configurations or operating condition will result in increased INL error. In signed mode INL is increased to: - 6LSB for sample rates above 1Msps, and up to 8LSB for 2Msps sample rate. - 6LSB for reference voltage below 1.1V when VCC is above 3.0V. - 20LSB for ambient temperature below 0 degree C and reference voltage below 1.3V. In unsigned mode, the INL error cannot be guaranteed, and this mode should not be used. Problem fix/Workaround None, avoid using the ADC in the above configurations in order to prevent increased INL error. Use the ADC in signed mode also for single ended measurements. 4. ADC gain stage output range is limited to 2.4 V The amplified output of the ADC gain stage will never go above 2.4 V, hence the differential input will only give correct output when below 2.4 V/gain. For the available gain settings, this gives a differential input range of: - 1x gain: 2.4 V - 2x gain: 1.2 V - 4x gain: 0.6 V - 8x gain: 300 mV - 16x gain: 150 mV - 32x gain: 75 mV - 64x gain: 38 mV 101 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround Keep the amplified voltage output from the ADC gain stage below 2.4 V in order to get a correct result, or keep ADC voltage reference below 2.4 V. 5. ADC Event on compare match non-functional ADC signalling event will be given at every conversion complete even if Interrupt mode (INTMODE) is set to BELOW or ABOVE. Problem fix/Workaround Enable and use interrupt on compare match when using the compare function. 6. Bandgap measurement with the ADC is non-functional when VCC is below 2.7V The ADC can not be used to do bandgap measurements when VCC is below 2.7V. Problem fix/Workaround None. 7. Accuracy lost on first three samples after switching input to ADC gain stage Due to memory effect in the ADC gain stage, the first three samples after changing input channel must be disregarded to achieve 12-bit accuracy. Problem fix/Workaround Run three ADC conversions and discard these results after changing input channels to ADC gain stage. 8. Configuration of PGM and CWCM not as described in XMEGA A Manual Enabling Common Waveform Channel Mode will enable Pattern generation mode (PGM), but not Common Waveform Channel Mode. Enabling Pattern Generation Mode (PGM) and not Common Waveform Channel Mode (CWCM) will enable both Pattern Generation Mode and Common Waveform Channel Mode. Problem fix/Workaround Table 36-2. Configure PWM and CWCM according to this table: PGM CWCM Description 0 0 PGM and CWCM disabled 0 1 PGM enabled 1 0 PGM and CWCM enabled 1 1 PGM enabled 9. PWM is not restarted properly after a fault in cycle-by-cycle mode When the AWeX fault restore mode is set to cycle-by-cycle, the waveform output will not return to normal operation at first update after fault condition is no longer present. Problem fix/Workaround Do a write to any AWeX I/O register to re-enable the output. 10. BOD will be enabled after any reset If any reset source goes active, the BOD will be enabled and keep the device in reset if the VCC voltage is below the programmed BOD level. During Power-On Reset, reset will not be released until VCC is above the programmed BOD level even if the BOD is disabled. 102 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround Do not set the BOD level higher than VCC even if the BOD is not used. 11. DAC is nonlinear and inaccurate when reference is above 2.4V or VCC - 0.6V Using the DAC with a reference voltage above 2.4V or VCC - 0.6V will give inaccurate output when converting codes that give below 0.75V output: - 10 LSB for continuous mode - 200 LSB for Sample and Hold mode Problem fix/Workaround None. 12. DAC has increased INL or noise for some operating conditions Some DAC configurations or operating condition will result in increased output error. - Continous mode: 5 LSB - Sample and hold mode: 15 LSB - Sample and hold mode for reference above 2.0v: up to 100 LSB Problem fix/Workaround None. 13. DAC refresh may be blocked in S/H mode If the DAC is running in Sample and Hold (S/H) mode and conversion for one channel is done at maximum rate (i.e. the DAC is always busy doing conversion for this channel), this will block refresh signals to the second channel. Problem fix/Workaround When using the DAC in S/H mode, ensure that none of the channels is running at maximum conversion rate, or ensure that the conversion rate of both channels is high enough to not require refresh. 14. Conversion lost on DAC channel B in event triggered mode If during dual channel operation channel 1 is set in auto trigged conversion mode, channel 1 conversions are occasionally lost. This means that not all data-values written to the Channel 1 data register are converted. Problem fix/Workaround Keep the DAC conversion interval in the range 000-001 (1 and 3 CLK), and limit the Peripheral clock frequency so the conversion internal never is shorter than 1.5 s. 15. EEPROM page buffer always written when NVM DATA0 is written If the EEPROM is memory mapped, writing to NVM DATA0 will corrupt data in the EEPROM page buffer. Problem fix/Workaround Before writing to NVM DATA0, for example when doing software CRC or flash page buffer write, check if EEPROM page buffer active loading flag (EELOAD) is set. Do not write NVM DATA0 when EELOAD is set. 103 8068T-AVR-12/10 XMEGA A3 16. Pending full asynchronous pin change interrupts will not wake the device Any full asynchronous pin-change Interrupt from pin 2, on any port, that is pending when the sleep instruction is executed, will be ignored until the device is woken from another source or the source triggers again. This applies when entering all sleep modes where the System Clock is stopped. Problem fix/Workaround None. 17. Pin configuration does not affect Analog Comparator output The Output/Pull and inverted pin configuration does not affect the Analog Comparator output. Problem fix/Workaround None for Output/Pull configuration. For inverted I/O, configure the Analog Comparator to give an inverted result (i.e. connect positive input to the negative AC input and vice versa), or use and external inverter to change polarity of Analog Comparator output. 18. NMI Flag for Crystal Oscillator Failure automatically cleared NMI flag for Crystal Oscillator Failure (XOSCFDIF) will be automatically cleared when executing the NMI interrupt handler. Problem fix/Workaround This device revision has only one NMI interrupt source, so checking the interrupt source in software is not required. 19. Writing EEPROM or Flash while reading any of them will not work The EEPROM and Flash cannot be written while reading EEPROM or Flash, or while executing code in Active mode. Problem fix/Workaround Enter IDLE sleep mode within 2.5 s (Five 2 MHz clock cycles and 80 32 MHz clock cycles) after starting an EEPROM or flash write operation. Wake-up source must either be EEPROM ready or NVM ready interrupt. Alternatively set up a Timer/Counter to give an overflow interrupt 7 ms after the erase or write operation has started, or 13 ms after atomic erase-and-write operation has started, and then enter IDLE sleep mode. 20. Crystal start-up time required after power-save even if crystal is source for RTC Even if 32.768 kHz crystal is used for RTC during sleep, the clock from the crystal will not be ready for the system before the specified start-up time. See "XOSCSEL[3:0]: Crystal Oscillator Selection" in XMEGA A Manual. If BOD is used in active mode, the BOD will be on during this period (0.5s). Problem fix/Workaround If faster start-up is required, go to sleep with internal oscillator as system clock. 21. RTC Counter value not correctly read after sleep If the RTC is set to wake up the device on RTC Overflow and bit 0 of RTC CNT is identical to bit 0 of RTC PER as the device is entering sleep, the value in the RTC count register can not be read correctly within the first prescaled RTC clock cycle after wakeup. The value read will be the same as the value in the register when entering sleep. The same applies if RTC Compare Match is used as wake-up source. 104 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround Wait at least one prescaled RTC clock cycle before reading the RTC CNT value. 22. Pending asynchronous RTC-interrupts will not wake up device Asynchronous Interrupts from the Real-Time-Counter that is pending when the sleep instruction is executed, will be ignored until the device is woken from another source or the source triggers again. Problem fix/Workaround None. 23. TWI Transmit collision flag not cleared on repeated start The TWI transmit collision flag should be automatically cleared on start and repeated start, but is only cleared on start. Problem fix/Workaround Clear the flag in software after address interrupt. 24. Clearing TWI Stop Interrupt Flag may lock the bus If software clears the STOP Interrupt Flag (APIF) on the same Peripheral Clock cycle as the hardware sets this flag due to a new address received, CLKHOLD is not cleared and the SCL line is not released. This will lock the bus. Problem fix/Workaround Check if the bus state is IDLE. If this is the case, it is safe to clear APIF. If the bus state is not IDLE, wait for the SCL pin to be low before clearing APIF. Code: /* Only clear the interrupt flag if within a "safe zone". */ while ( /* Bus not IDLE: */ ((COMMS_TWI.MASTER.STATUS & TWI_MASTER_BUSSTATE_gm) != TWI_MASTER_BUSSTATE_IDLE_gc)) && /* SCL not held by slave: */ !(COMMS_TWI.SLAVE.STATUS & TWI_SLAVE_CLKHOLD_bm) ) { /* Ensure that the SCL line is low */ if ( !(COMMS_PORT.IN & PIN1_bm) ) if ( !(COMMS_PORT.IN & PIN1_bm) ) break; } /* Check for an pending address match interrupt */ if ( !(COMMS_TWI.SLAVE.STATUS & TWI_SLAVE_CLKHOLD_bm) ) { /* Safely clear interrupt flag */ COMMS_TWI.SLAVE.STATUS |= (uint8_t)TWI_SLAVE_APIF_bm; } 25. TWI START condition at bus timeout will cause transaction to be dropped If Bus Timeout is enabled and a timeout occurs on the same Peripheral Clock cycle as a START is detected, the transaction will be dropped. 105 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround None. 26. TWI Data Interrupt Flag erroneously read as set When issuing the TWI slave response command CMD=0b11, it takes 1 Peripheral Clock cycle to clear the data interrupt flag (DIF). A read of DIF directly after issuing the command will show the DIF still set. Problem fix/Workaround Add one NOP instruction before checking DIF. 27. WDR instruction inside closed window will not issue reset When a WDR instruction is execute within one ULP clock cycle after updating the window control register, the counter can be cleared without giving a system reset. Problem fix/Workaround Wait at least one ULP clock cycle before executing a WDR instruction. 106 8068T-AVR-12/10 XMEGA A3 36.1.3 rev. A * * * * * * * * * * * Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously ADC gain stage output range is limited to 2.4V Sampled BOD in Active mode will cause noise when bandgap is used as reference Flash Power Reduction Mode can not be enabled when entering sleep mode JTAG enable does not override Analog Comparator B output Bandgap measurement with the ADC is non-functional when VCC is below 2.7V DAC refresh may be blocked in S/H mode BOD will be enabled after any reset Both DFLLs and both oscillators has to be enabled for one to work Operating frequency and voltage limitations Inverted I/O enable does not affect Analog Comparator Output 1. Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously If the bandgap voltage is selected as input for one Analog Comparator (AC) and then selected/deselected as input for the another AC, the first comparator will be affected for up to 1 us and could potentially give a wrong comparison result. Problem fix/Workaround If the Bandgap is required for both ACs simultaneously, configure the input selection for both ACs before enabling any of them. 2. ADC gain stage output range is limited to 2.4 V The amplified output of the ADC gain stage will never go above 2.4 V, hence the differential input will only give correct output when below 2.4 V/gain. For the available gain settings, this gives a differential input range of: - 1x gain: 2.4 V - 2x gain: 1.2 V - 4x gain: 0.6 V - 8x gain: 300 mV - 16x gain: 150 mV - 32x gain: 75 mV - 64x gain: 38 mV Problem fix/Workaround Keep the amplified voltage output from the ADC gain stage below 2.4 V in order to get a correct result, or keep ADC voltage reference below 2.4 V. 3. Sampled BOD in Active mode will cause noise when bandgap is used as reference Using the BOD in sampled mode when the device is running in Active or Idle mode will add noise on the bandgap reference for ADC, DAC and Analog Comparator. Problem fix/Workaround If the bandgap is used as reference for either the ADC, DAC and Analog Comparator, the BOD must not be set in sampled mode. 107 8068T-AVR-12/10 XMEGA A3 4. Flash Power Reduction Mode can not be enabled when entering sleep mode If Flash Power Reduction Mode is enabled when a deep sleep mode, the device will only wake up on every fourth wake-up request. If Flash Power Reduction Mode is enabled when entering Idle sleep mode, the wake-up time will vary with up to 16 CPU clock cycles. Problem fix/Workaround Disable Flash Power Reduction mode before entering sleep mode. 5. JTAG enable does not override Analog Comparator B output When JTAG is enabled this will not override the Anlog Comparator B (ACB)ouput, AC0OUT on pin 7 if this is enabled. Problem fix/Workaround AC0OUT for ACB should not be enabled when JTAG is used. Use only analog comparator output for ACA when JTAG is used, or use the PDI as debug interface. 6. Bandgap measurement with the ADC is non-functional when VCC is below 2.7V The ADC cannot be used to do bandgap measurements when VCC is below 2.7V. Problem fix/Workaround If internal voltages must be measured when VCC is below 2.7V, measure the internal 1.00V reference instead of the bandgap. 7. DAC refresh may be blocked in S/H mode If the DAC is running in Sample and Hold (S/H) mode and conversion for one channel is done at maximum rate (i.e. the DAC is always busy doing conversion for this channel), this will block refresh signals to the second channel. Problem fix/Workarund When using the DAC in S/H mode, ensure that none of the channels is running at maximum conversion rate, or ensure that the conversion rate of both channels is high enough to not require refresh. 8. BOD will be enabled after any reset If any reset source goes active, the BOD will be enabled and keep the device in reset if the VCC voltage is below the programmed BOD level. During Power-On Reset, reset will not be released until VCC is above the programmed BOD level even if the BOD is disabled. Problem fix/Workaround Do not set the BOD level higher than VCC even if the BOD is not used. 9. Both DFLLs and both oscillators has to be enabled for one to work In order to use the automatic runtime calibration for the 2 MHz or the 32MHz internal oscillators, the DFLL for both oscillators and both oscillators has to be enabled for one to work. Problem fix/Workaround Enable both the DFLLs and both oscillators when using automatic runtime calibration for one of the internal oscillators. 108 8068T-AVR-12/10 XMEGA A3 10. Operating Frequency and Voltage Limitation To ensure correct operation, there is a limit on operating frequency and voltage. Figure 36-3 on page 109 shows the safe operating area. Figure 36-3. Operating Frequnecy and Voltage Limitation MHz 30 15 Safe operating area 2.4 3.6 V Problem fix/Workaround None, avoid using the device outside these frequnecy and voltage limitations. 11. Inverted I/O enable does not affect Analog Comparator Output The inverted I/O pin function does not affect the Analog Comparator output function. Problem fix/Workarund Configure the analog comparator setup to give a inverted result (i.e. connect positive input to the negative AC input and vice versa), or use and externel inverter to change polarity of Analog Comparator Output. 109 8068T-AVR-12/10 XMEGA A3 36.2 36.2.1 ATxmega192A3, ATxmega128A3, ATxmega64A3 rev. E * * * * * * * * * * * * * * * * * * * * * * * * * * Bandgap voltage input for the ACs can not be changed when used for both ACs simultaneously VCC voltage scaler for AC is non-linear ADC has increased INL error for some operating conditions ADC gain stage output range is limited to 2.4 V ADC Event on compare match non-functional Bandgap measurement with the ADC is non-functional when VCC is below 2.7V Accuracy lost on first three samples after switching input to ADC gain stage Configuration of PGM and CWCM not as described in XMEGA A Manual PWM is not restarted properly after a fault in cycle-by-cycle mode BOD will be enabled at any reset DAC is nonlinear and inaccurate when reference is above 2.4V or VCC - 0.6V DAC has increased INL or noise for some operating conditions DAC refresh may be blocked in S/H mode Conversion lost on DAC channel B in event triggered mode EEPROM page buffer always written when NVM DATA0 is written Pending full asynchronous pin change interrupts will not wake the device Pin configuration does not affect Analog Comparator Output NMI Flag for Crystal Oscillator Failure automatically cleared Crystal start-up time required after power-save even if crystal is source for RTC RTC Counter value not correctly read after sleep Pending asynchronous RTC-interrupts will not wake up device TWI Transmit collision flag not cleared on repeated start Clearing TWI Stop Interrupt Flag may lock the bus TWI START condition at bus timeout will cause transaction to be dropped TWI Data Interrupt Flag (DIF) erroneously read as set WDR instruction inside closed window will not issue reset 1. Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously If the Bandgap voltage is selected as input for one Analog Comparator (AC) and then selected/deselected as input for another AC, the first comparator will be affected for up to 1 s and could potentially give a wrong comparison result. Problem fix/Workaround If the Bandgap is required for both ACs simultaneously, configure the input selection for both ACs before enabling any of them. 2. VCC voltage scaler for AC is non-linear The 6-bit VCC voltage scaler in the Analog Comparators is non-linear. 110 8068T-AVR-12/10 XMEGA A3 Figure 36-4. Analog Comparator Voltage Scaler vs. Scalefac T = 25C 3.5 3.3 V 3 2.7 V VSCALE [V] 2.5 2 1.8 V 1.5 1 0.5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 SCALEFAC Problem fix/Workaround Use external voltage input for the analog comparator if accurate voltage levels are needed 3. ADC has increased INL error for some operating conditions Some ADC configurations or operating condition will result in increased INL error. In signed mode INL is increased to: - 6LSB for sample rates above 1Msps, and up to 8 LSB for 2Msps sample rate. - 6LSB for reference voltage below 1.1V when VCC is above 3.0V. - 20LSB for ambient temperature below 0 degree C and reference voltage below 1.3V. In unsigned mode, the INL error cannot be guaranteed, and this mode should not be used. Problem fix/Workaround None, avoid using the ADC in the above configurations in order to prevent increased INL error. Use the ADC in signed mode also for single ended measurements. 4. ADC gain stage output range is limited to 2.4 V The amplified output of the ADC gain stage will never go above 2.4 V, hence the differential input will only give correct output when below 2.4 V/gain. For the available gain settings, this gives a differential input range of: - 1x gain: 2.4 V - 2x gain: 1.2 V - 4x gain: 0.6 V - 8x gain: 300 mV - 16x gain: 150 mV - 32x gain: 75 mV - 64x gain: 38 mV 111 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround Keep the amplified voltage output from the ADC gain stage below 2.4 V in order to get a correct result, or keep ADC voltage reference below 2.4 V. 5. ADC Event on compare match non-functional ADC signalling event will be given at every conversion complete even if Interrupt mode (INTMODE) is set to BELOW or ABOVE. Problem fix/Workaround Enable and use interrupt on compare match when using the compare function. 6. Bandgap measurement with the ADC is non-functional when VCC is below 2.7V The ADC can not be used to do bandgap measurements when VCC is below 2.7V. Problem fix/Workaround None. 7. Accuracy lost on first three samples after switching input to ADC gain stage Due to memory effect in the ADC gain stage, the first three samples after changing input channel must be disregarded to achieve 12-bit accuracy. Problem fix/Workaround Run three ADC conversions and discard these results after changing input channels to ADC gain stage. 8. Configuration of PGM and CWCM not as described in XMEGA A Manual Enabling Common Waveform Channel Mode will enable Pattern generation mode (PGM), but not Common Waveform Channel Mode. Enabling Pattern Generation Mode (PGM) and not Common Waveform Channel Mode (CWCM) will enable both Pattern Generation Mode and Common Waveform Channel Mode. Problem fix/Workaround Table 36-3. Configure PWM and CWCM according to this table: PGM CWCM Description 0 0 PGM and CWCM disabled 0 1 PGM enabled 1 0 PGM and CWCM enabled 1 1 PGM enabled 9. PWM is not restarted properly after a fault in cycle-by-cycle mode When the AWeX fault restore mode is set to cycle-by-cycle, the waveform output will not return to normal operation at first update after fault condition is no longer present. Problem fix/Workaround Do a write to any AWeX I/O register to re-enable the output. 10. BOD will be enabled after any reset If any reset source goes active, the BOD will be enabled and keep the device in reset if the VCC voltage is below the programmed BOD level. During Power-On Reset, reset will not be released until VCC is above the programmed BOD level even if the BOD is disabled. 112 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround Do not set the BOD level higher than VCC even if the BOD is not used. 11. DAC is nonlinear and inaccurate when reference is above 2.4V or VCC - 0.6V Using the DAC with a reference voltage above 2.4V or VCC - 0.6V will give inaccurate output when converting codes that give below 0.75V output: - 10 LSB for continuous mode - 200 LSB for Sample and Hold mode Problem fix/Workaround None. 12. DAC has increased INL or noise for some operating conditions Some DAC configurations or operating condition will result in increased output error. - Continous mode: 5 LSB - Sample and hold mode: 15 LSB - Sample and hold mode for reference above 2.0v: up to 100 LSB Problem fix/Workaround None. 13. DAC refresh may be blocked in S/H mode If the DAC is running in Sample and Hold (S/H) mode and conversion for one channel is done at maximum rate (i.e. the DAC is always busy doing conversion for this channel), this will block refresh signals to the second channel. Problem fix/Workaround When using the DAC in S/H mode, ensure that none of the channels is running at maximum conversion rate, or ensure that the conversion rate of both channels is high enough to not require refresh. 14. Conversion lost on DAC channel B in event triggered mode If during dual channel operation channel 1 is set in auto trigged conversion mode, channel 1 conversions are occasionally lost. This means that not all data-values written to the Channel 1 data register are converted. Problem fix/Workaround Keep the DAC conversion interval in the range 000-001 (1 and 3 CLK), and limit the Peripheral clock frequency so the conversion internal never is shorter than 1.5 s. 15. EEPROM page buffer always written when NVM DATA0 is written If the EEPROM is memory mapped, writing to NVM DATA0 will corrupt data in the EEPROM page buffer. Problem fix/Workaround Before writing to NVM DATA0, for example when doing software CRC or flash page buffer write, check if EEPROM page buffer active loading flag (EELOAD) is set. Do not write NVM DATA0 when EELOAD is set. 113 8068T-AVR-12/10 XMEGA A3 16. Pending full asynchronous pin change interrupts will not wake the device Any full asynchronous pin-change Interrupt from pin 2, on any port, that is pending when the sleep instruction is executed, will be ignored until the device is woken from another source or the source triggers again. This applies when entering all sleep modes where the System Clock is stopped. Problem fix/Workaround None. 17. Pin configuration does not affect Analog Comparator output The Output/Pull and inverted pin configuration does not affect the Analog Comparator output. Problem fix/Workaround None for Output/Pull configuration. For inverted I/O, configure the Analog Comparator to give an inverted result (i.e. connect positive input to the negative AC input and vice versa), or use and external inverter to change polarity of Analog Comparator output. 18. NMI Flag for Crystal Oscillator Failure automatically cleared NMI flag for Crystal Oscillator Failure (XOSCFDIF) will be automatically cleared when executing the NMI interrupt handler. Problem fix/Workaround This device revision has only one NMI interrupt source, so checking the interrupt source in software is not required. 19. Crystal start-up time required after power-save even if crystal is source for RTC Even if 32.768 kHz crystal is used for RTC during sleep, the clock from the crystal will not be ready for the system before the specified start-up time. See "XOSCSEL[3:0]: Crystal Oscillator Selection" in XMEGA A Manual. If BOD is used in active mode, the BOD will be on during this period (0.5s). Problem fix/Workaround If faster start-up is required, go to sleep with internal oscillator as system clock. 20. RTC Counter value not correctly read after sleep If the RTC is set to wake up the device on RTC Overflow and bit 0 of RTC CNT is identical to bit 0 of RTC PER as the device is entering sleep, the value in the RTC count register can not be read correctly within the first prescaled RTC clock cycle after wakeup. The value read will be the same as the value in the register when entering sleep. The same applies if RTC Compare Match is used as wake-up source. Problem fix/Workaround Wait at least one prescaled RTC clock cycle before reading the RTC CNT value. 21. Pending asynchronous RTC-interrupts will not wake up device Asynchronous Interrupts from the Real-Time-Counter that is pending when the sleep instruction is executed, will be ignored until the device is woken from another source or the source triggers again. Problem fix/Workaround None. 114 8068T-AVR-12/10 XMEGA A3 22. TWI Transmit collision flag not cleared on repeated start The TWI transmit collision flag should be automatically cleared on start and repeated start, but is only cleared on start. Problem fix/Workaround Clear the flag in software after address interrupt. 23. Clearing TWI Stop Interrupt Flag may lock the bus If software clears the STOP Interrupt Flag (APIF) on the same Peripheral Clock cycle as the hardware sets this flag due to a new address received, CLKHOLD is not cleared and the SCL line is not released. This will lock the bus. Problem fix/Workaround Check if the bus state is IDLE. If this is the case, it is safe to clear APIF. If the bus state is not IDLE, wait for the SCL pin to be low before clearing APIF. Code: /* Only clear the interrupt flag if within a "safe zone". */ while ( /* Bus not IDLE: */ ((COMMS_TWI.MASTER.STATUS & TWI_MASTER_BUSSTATE_gm) != TWI_MASTER_BUSSTATE_IDLE_gc)) && /* SCL not held by slave: */ !(COMMS_TWI.SLAVE.STATUS & TWI_SLAVE_CLKHOLD_bm) ) { /* Ensure that the SCL line is low */ if ( !(COMMS_PORT.IN & PIN1_bm) ) if ( !(COMMS_PORT.IN & PIN1_bm) ) break; } /* Check for an pending address match interrupt */ if ( !(COMMS_TWI.SLAVE.STATUS & TWI_SLAVE_CLKHOLD_bm) ) { /* Safely clear interrupt flag */ COMMS_TWI.SLAVE.STATUS |= (uint8_t)TWI_SLAVE_APIF_bm; } 24. TWI START condition at bus timeout will cause transaction to be dropped If Bus Timeout is enabled and a timeout occurs on the same Peripheral Clock cycle as a START is detected, the transaction will be dropped. Problem fix/Workaround None. 25. TWI Data Interrupt Flag erroneously read as set When issuing the TWI slave response command CMD=0b11, it takes 1 Peripheral Clock cycle to clear the data interrupt flag (DIF). A read of DIF directly after issuing the command will show the DIF still set. Problem fix/Workaround Add one NOP instruction before checking DIF. 115 8068T-AVR-12/10 XMEGA A3 26. WDR instruction inside closed window will not issue reset When a WDR instruction is execute within one ULP clock cycle after updating the window control register, the counter can be cleared without giving a system reset. Problem fix/Workaround Wait at least one ULP clock cycle before executing a WDR instruction. 116 8068T-AVR-12/10 XMEGA A3 36.2.2 rev. B * * * * * * * * * * * * * * * * * * * * * * * * * * * Bandgap voltage input for the ACs can not be changed when used for both ACs simultaneously VCC voltage scaler for AC is non-linear ADC has increased INL error for some operating conditions ADC gain stage output range is limited to 2.4 V ADC Event on compare match non-functional Bandgap measurement with the ADC is non-functional when VCC is below 2.7V Accuracy lost on first three samples after switching input to ADC gain stage Configuration of PGM and CWCM not as described in XMEGA A Manual PWM is not restarted properly after a fault in cycle-by-cycle mode BOD will be enabled at any reset DAC is nonlinear and inaccurate when reference is above 2.4V or VCC - 0.6V DAC has increased INL or noise for some operating conditions DAC refresh may be blocked in S/H mode Conversion lost on DAC channel B in event triggered mode EEPROM page buffer always written when NVM DATA0 is written Pending full asynchronous pin change interrupts will not wake the device Pin configuration does not affect Analog Comparator Output NMI Flag for Crystal Oscillator Failure automatically cleared Writing EEPROM or Flash while reading any of them will not work Crystal start-up time required after power-save even if crystal is source for RTC RTC Counter value not correctly read after sleep Pending asynchronous RTC-interrupts will not wake up device TWI Transmit collision flag not cleared on repeated start Clearing TWI Stop Interrupt Flag may lock the bus TWI START condition at bus timeout will cause transaction to be dropped TWI Data Interrupt Flag (DIF) erroneously read as set WDR instruction inside closed window will not issue reset 1. Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously If the Bandgap voltage is selected as input for one Analog Comparator (AC) and then selected/deselected as input for another AC, the first comparator will be affected for up to 1 s and could potentially give a wrong comparison result. Problem fix/Workaround If the Bandgap is required for both ACs simultaneously, configure the input selection for both ACs before enabling any of them. 2. VCC voltage scaler for AC is non-linear The 6-bit VCC voltage scaler in the Analog Comparators is non-linear. 117 8068T-AVR-12/10 XMEGA A3 Figure 36-5. Analog Comparator Voltage Scaler vs. Scalefac T = 25C 3.5 3.3 V 3 2.7 V VSCALE [V] 2.5 2 1.8 V 1.5 1 0.5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 SCALEFAC Problem fix/Workaround Use external voltage input for the analog comparator if accurate voltage levels are needed 3. ADC has increased INL error for some operating conditions Some ADC configurations or operating condition will result in increased INL error. In signed mode INL is increased to: - 6LSB for sample rates above 1Msps, and up to 8 LSB for 2Msps sample rate. - 6LSB for reference voltage below 1.1V when VCC is above 3.0V. - 20LSB for ambient temperature below 0 degree C and reference voltage below 1.3V. In unsigned mode, the INL error cannot be guaranteed, and this mode should not be used. Problem fix/Workaround None, avoid using the ADC in the above configurations in order to prevent increased INL error. Use the ADC in signed mode also for single ended measurements. 4. ADC gain stage output range is limited to 2.4 V The amplified output of the ADC gain stage will never go above 2.4 V, hence the differential input will only give correct output when below 2.4 V/gain. For the available gain settings, this gives a differential input range of: - 1x gain: 2.4 V - 2x gain: 1.2 V - 4x gain: 0.6 V - 8x gain: 300 mV - 16x gain: 150 mV - 32x gain: 75 mV - 64x gain: 38 mV 118 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround Keep the amplified voltage output from the ADC gain stage below 2.4 V in order to get a correct result, or keep ADC voltage reference below 2.4 V. 5. ADC Event on compare match non-functional ADC signalling event will be given at every conversion complete even if Interrupt mode (INTMODE) is set to BELOW or ABOVE. Problem fix/Workaround Enable and use interrupt on compare match when using the compare function. 6. Bandgap measurement with the ADC is non-functional when VCC is below 2.7V The ADC can not be used to do bandgap measurements when VCC is below 2.7V. Problem fix/Workaround None. 7. Accuracy lost on first three samples after switching input to ADC gain stage Due to memory effect in the ADC gain stage, the first three samples after changing input channel must be disregarded to achieve 12-bit accuracy. Problem fix/Workaround Run three ADC conversions and discard these results after changing input channels to ADC gain stage. 8. Configuration of PGM and CWCM not as described in XMEGA A Manual Enabling Common Waveform Channel Mode will enable Pattern generation mode (PGM), but not Common Waveform Channel Mode. Enabling Pattern Generation Mode (PGM) and not Common Waveform Channel Mode (CWCM) will enable both Pattern Generation Mode and Common Waveform Channel Mode. Problem fix/Workaround Table 36-4. Configure PWM and CWCM according to this table: PGM CWCM Description 0 0 PGM and CWCM disabled 0 1 PGM enabled 1 0 PGM and CWCM enabled 1 1 PGM enabled 9. PWM is not restarted properly after a fault in cycle-by-cycle mode When the AWeX fault restore mode is set to cycle-by-cycle, the waveform output will not return to normal operation at first update after fault condition is no longer present. Problem fix/Workaround Do a write to any AWeX I/O register to re-enable the output. 10. BOD will be enabled after any reset If any reset source goes active, the BOD will be enabled and keep the device in reset if the VCC voltage is below the programmed BOD level. During Power-On Reset, reset will not be released until VCC is above the programmed BOD level even if the BOD is disabled. 119 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround Do not set the BOD level higher than VCC even if the BOD is not used. 11. DAC is nonlinear and inaccurate when reference is above 2.4V or VCC - 0.6V Using the DAC with a reference voltage above 2.4V or VCC - 0.6V will give inaccurate output when converting codes that give below 0.75V output: - 10 LSB for continuous mode - 200 LSB for Sample and Hold mode Problem fix/Workaround None. 12. DAC has increased INL or noise for some operating conditions Some DAC configurations or operating condition will result in increased output error. - Continous mode: 5 LSB - Sample and hold mode: 15 LSB - Sample and hold mode for reference above 2.0v: up to 100 LSB Problem fix/Workaround None. 13. DAC refresh may be blocked in S/H mode If the DAC is running in Sample and Hold (S/H) mode and conversion for one channel is done at maximum rate (i.e. the DAC is always busy doing conversion for this channel), this will block refresh signals to the second channel. Problem fix/Workaround When using the DAC in S/H mode, ensure that none of the channels is running at maximum conversion rate, or ensure that the conversion rate of both channels is high enough to not require refresh. 14. Conversion lost on DAC channel B in event triggered mode If during dual channel operation channel 1 is set in auto trigged conversion mode, channel 1 conversions are occasionally lost. This means that not all data-values written to the Channel 1 data register are converted. Problem fix/Workaround Keep the DAC conversion interval in the range 000-001 (1 and 3 CLK), and limit the Peripheral clock frequency so the conversion internal never is shorter than 1.5 s. 15. EEPROM page buffer always written when NVM DATA0 is written If the EEPROM is memory mapped, writing to NVM DATA0 will corrupt data in the EEPROM page buffer. Problem fix/Workaround Before writing to NVM DATA0, for example when doing software CRC or flash page buffer write, check if EEPROM page buffer active loading flag (EELOAD) is set. Do not write NVM DATA0 when EELOAD is set. 120 8068T-AVR-12/10 XMEGA A3 16. Pending full asynchronous pin change interrupts will not wake the device Any full asynchronous pin-change Interrupt from pin 2, on any port, that is pending when the sleep instruction is executed, will be ignored until the device is woken from another source or the source triggers again. This applies when entering all sleep modes where the System Clock is stopped. Problem fix/Workaround None. 17. Pin configuration does not affect Analog Comparator output The Output/Pull and inverted pin configuration does not affect the Analog Comparator output. Problem fix/Workaround None for Output/Pull configuration. For inverted I/O, configure the Analog Comparator to give an inverted result (i.e. connect positive input to the negative AC input and vice versa), or use and external inverter to change polarity of Analog Comparator output. 18. NMI Flag for Crystal Oscillator Failure automatically cleared NMI flag for Crystal Oscillator Failure (XOSCFDIF) will be automatically cleared when executing the NMI interrupt handler. Problem fix/Workaround This device revision has only one NMI interrupt source, so checking the interrupt source in software is not required. 19. Writing EEPROM or Flash while reading any of them will not work The EEPROM and Flash cannot be written while reading EEPROM or Flash, or while executing code in Active mode. Problem fix/Workaround Enter IDLE sleep mode within 2.5 s (Five 2 MHz clock cycles and 80 32 MHz clock cycles) after starting an EEPROM or flash write operation. Wake-up source must either be EEPROM ready or NVM ready interrupt. Alternatively set up a Timer/Counter to give an overflow interrupt 7 ms after the erase or write operation has started, or 13 ms after atomic erase-and-write operation has started, and then enter IDLE sleep mode. 20. Crystal start-up time required after power-save even if crystal is source for RTC Even if 32.768 kHz crystal is used for RTC during sleep, the clock from the crystal will not be ready for the system before the specified start-up time. See "XOSCSEL[3:0]: Crystal Oscillator Selection" in XMEGA A Manual. If BOD is used in active mode, the BOD will be on during this period (0.5s). Problem fix/Workaround If faster start-up is required, go to sleep with internal oscillator as system clock. 21. RTC Counter value not correctly read after sleep If the RTC is set to wake up the device on RTC Overflow and bit 0 of RTC CNT is identical to bit 0 of RTC PER as the device is entering sleep, the value in the RTC count register can not be read correctly within the first prescaled RTC clock cycle after wakeup. The value read will be the same as the value in the register when entering sleep. The same applies if RTC Compare Match is used as wake-up source. 121 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround Wait at least one prescaled RTC clock cycle before reading the RTC CNT value. 22. Pending asynchronous RTC-interrupts will not wake up device Asynchronous Interrupts from the Real-Time-Counter that is pending when the sleep instruction is executed, will be ignored until the device is woken from another source or the source triggers again. Problem fix/Workaround None. 23. TWI Transmit collision flag not cleared on repeated start The TWI transmit collision flag should be automatically cleared on start and repeated start, but is only cleared on start. Problem fix/Workaround Clear the flag in software after address interrupt. 24. Clearing TWI Stop Interrupt Flag may lock the bus If software clears the STOP Interrupt Flag (APIF) on the same Peripheral Clock cycle as the hardware sets this flag due to a new address received, CLKHOLD is not cleared and the SCL line is not released. This will lock the bus. Problem fix/Workaround Check if the bus state is IDLE. If this is the case, it is safe to clear APIF. If the bus state is not IDLE, wait for the SCL pin to be low before clearing APIF. Code: /* Only clear the interrupt flag if within a "safe zone". */ while ( /* Bus not IDLE: */ ((COMMS_TWI.MASTER.STATUS & TWI_MASTER_BUSSTATE_gm) != TWI_MASTER_BUSSTATE_IDLE_gc)) && /* SCL not held by slave: */ !(COMMS_TWI.SLAVE.STATUS & TWI_SLAVE_CLKHOLD_bm) ) { /* Ensure that the SCL line is low */ if ( !(COMMS_PORT.IN & PIN1_bm) ) if ( !(COMMS_PORT.IN & PIN1_bm) ) break; } /* Check for an pending address match interrupt */ if ( !(COMMS_TWI.SLAVE.STATUS & TWI_SLAVE_CLKHOLD_bm) ) { /* Safely clear interrupt flag */ COMMS_TWI.SLAVE.STATUS |= (uint8_t)TWI_SLAVE_APIF_bm; } 25. TWI START condition at bus timeout will cause transaction to be dropped If Bus Timeout is enabled and a timeout occurs on the same Peripheral Clock cycle as a START is detected, the transaction will be dropped. 122 8068T-AVR-12/10 XMEGA A3 Problem fix/Workaround None. 26. TWI Data Interrupt Flag erroneously read as set When issuing the TWI slave response command CMD=0b11, it takes 1 Peripheral Clock cycle to clear the data interrupt flag (DIF). A read of DIF directly after issuing the command will show the DIF still set. Problem fix/Workaround Add one NOP instruction before checking DIF. 27. WDR instruction inside closed window will not issue reset When a WDR instruction is execute within one ULP clock cycle after updating the window control register, the counter can be cleared without giving a system reset. Problem fix/Workaround Wait at least one ULP clock cycle before executing a WDR instruction. 36.2.3 rev. A Not sampled. 123 8068T-AVR-12/10 XMEGA A3 37. Datasheet Revision History Please note that the referring page numbers in this section are referred to this document. The referring revision in this section are referring to the document revision. 37.1 37.2 37.3 8068T - 12/10 1. Datasheet status changed to complete: Preliminary removed from the front page. 2. Updated all tables in the "Electrical Characteristics" . 3. Updated "Packaging information" on page 61. 4. Replaced Table 34-11 on page 69 5. Replaced Table 34-18 on page 71 and added the figure "TOSC input capacitance" on page 71 6. Added ERRATA "rev. E" . 7. Added ERRATA "rev. B" . 8. Updated ERRATA for ADC (ADC has increased INL error for some operating conditions). 9. Updated the last page by Atmel new Brand Style Guide. 10. Updated "Errata" on page 93. 1. Updated the Footnote 3 of "Ordering Information" on page 2. 2. Updated Footnote 2 of Figure 2-1 on page 3. 3. Updated "Data Memory Map (Hexadecimal address)" on page 11. 192A3 has 2 KB EEPROM. 4. Updated "Features" on page 27. Event Channel 0 output on port pin 7. 5. Updated "Absolute Maximum Ratings*" on page 63 by adding Icc for Flash/EEPROM Programming. 6. Added AVCC in "ADC Characteristics" on page 67. 7. Updated Start up time in "ADC Characteristics" on page 67. 8. Updated "DAC Characteristics" on page 68. Removed DC output impedence. 9. Updated Figure 35-6 on page 74. Replaced the figure by a correct one. 10. Fixed typo in "Errata" section. 8068S - 09/10 8068R - 08/10 124 8068T-AVR-12/10 XMEGA A3 37.4 37.5 37.6 37.7 37.8 8068Q - 02/10 1. Added "PDI Speed" on page 92. 1. Updated the device pin-out Figure 2-1 on page 3. PDI_CLK and PDI_DATA renamed only PDI. 2. Removed JTAG Reset from the datasheet. 3. Updated "DAC - 12-bit Digital to Analog Converter" on page 43. DAC uses internal 1.0 voltage. 4. Added Table 34-19 on page 71. 5. Updated "Timer/Counter and AWEX functions" on page 49. 6. Updated "Alternate Pin Function Description" on page 49. 7. Updated all "Electrical Characteristics" on page 63. 8. Updated "PAD Characteristics" on page 69. 9. Changed Internal Oscillator Speed to "Oscillators and Wake-up Time" on page 88. 10. Updated "Errata" on page 93 1. Updated Table 34-3 on page 66, Endurance and Data Retention. 2. Updated Table 34-11 on page 69, Input hysteresis is in V and not in mV. 3. Updated "Errata" on page 93. 1. Updated "Errata" on page 93. 1. Updated "Electrical Characteristics" on page 63. 2. Added "Flash and EEPROM Memory Characteristics" on page 66. 3. Added Errata for "ATxmega192A3, ATxmega128A3, ATxmega64A3" on page 110. 8068P - 02/10 8068O - 11/09 8068N - 10/09 8068M - 09/09 125 8068T-AVR-12/10 XMEGA A3 37.9 8068L - 06/09 1. Updated "Ordering Information" on page 2. 2. Updated "Features" on page 39. 3. Updated "Overview" on page 43. 4. Updated "Overview" on page 48. 5. Added "Electrical Characteristics" on page 63. 6. Added "Typical Characteristics" on page 72. 7. Updated ""Errata" on page 93. 1. Added "Errata" on page 93 for ATxmega256A3 rev B. 1. Added "Errata" on page 93 for ATxmega256A3 rev A. 1. Updated Featurelist in "Memories" on page 9. 1. Updated Table 14-1 on page 25. 1. Updated "Features" on page 1. 2. Updated "Ordering Information" on page 2. 3. Updated "Features" on page 9 by removing "External Memory...". 4. Updated Figure 7-1 on page 10 and Figure 7-2 on page 11. 37.10 8068K - 02/09 37.11 8068J - 12/08 37.12 8068I - 11/08 37.13 8068H - 10/08 37.14 8068G - 09/08 126 8068T-AVR-12/10 XMEGA A3 5. Updated Table 7-2 on page 14 and Table 7-3 on page 14. 6. Updated "Features" on page 41 and "Overview" on page 41. 7 Removed "Interrupt Vector Summary" section from datasheet. 1. Changed Figure 2-1's title to "Block diagram and pinout." 2. Changed Package Type to "64M2" in "Ordering Information" on page 2 and in "Errata" on page 93. 3. Updated Table 30-5 on page 52. 4. Inserted a correct "64A" TQFP drawing on page 61. 1. Updated "Block Diagram" on page 5. 2. Inserted "Interrupt Vector Summary" on page 54. 1. References to External Bus Interface (EBI) removed from "Features" on page 1. 1. Updated "Features" on page 1. 2. Updated Figure 2-1 on page 3. 3. Updated "Overview" on page 4. 4. Updated Table 7-2 on page 14. 5. Replaced Figure 25-1 on page 42 by a correct one. 6. Updated "Features" and "Overview" on page 43. 7. Updated all tables in section "Alternate Pin Functions" on page 51. 1. Updated "Features" on page 1. 2. Updated "" on page 2 and "Pinout and Pin Functions" on page 49. 3. Updated "Ordering Information" on page 2. 37.15 8068F - 08/08 37.16 8068E - 08/08 37.17 8068D - 06/08 37.18 8068C - 06/08 37.19 8068B - 06/08 127 8068T-AVR-12/10 XMEGA A3 4. Updated "Overview" on page 4, included the XMEGA A3 explanation text on page 6. 5. Added XMEGA A3 Block Diagram, Figure 3-1 on page 5. 6. Updated AVR CPU "Overview" on page 7 and Updated Figure 6-1 on page 7. 7. Updated Event System block diagram, Figure 9-1 on page 17. 8. Updated "PMIC - Programmable Multi-level Interrupt Controller" on page 25. 9. Updated "AC - Analog Comparator" on page 44. 10. Updated "I/O configuration" on page 27. 11. Inserted a new Figure 16-1 on page 32. 12. Updated "Peripheral Module Address Map" on page 56. 13. Inserted "Instruction Set Summary" on page 57. 14. Added Speed grades in "Operating Voltage and Frequency" on page 65. 1. Initial revision. 37.20 8068A - 02/08 128 8068T-AVR-12/10 XMEGA A3 Table of Contents Features ..................................................................................................... 1 Typical Applications ................................................................................ 1 1 Ordering Information ............................................................................... 2 2 Pinout/Block Diagram .............................................................................. 3 3 Overview ................................................................................................... 4 3.1Block Diagram ...........................................................................................................5 4 Resources ................................................................................................. 6 4.1Recommended reading .............................................................................................6 5 Disclaimer ................................................................................................. 6 6 AVR CPU ................................................................................................... 7 6.1Features ....................................................................................................................7 6.2Overview ...................................................................................................................7 6.3Register File ..............................................................................................................8 6.4ALU - Arithmetic Logic Unit .......................................................................................8 6.5Program Flow ............................................................................................................8 7 Memories .................................................................................................. 9 7.1Features ....................................................................................................................9 7.2Overview ...................................................................................................................9 7.3In-System Programmable Flash Program Memory .................................................10 7.4Data Memory ...........................................................................................................11 7.5Production Signature Row .......................................................................................13 7.6User Signature Row ................................................................................................13 7.7Flash and EEPROM Page Size ...............................................................................14 8 DMAC - Direct Memory Access Controller .......................................... 15 8.1Features ..................................................................................................................15 8.2Overview .................................................................................................................15 9 Event System ......................................................................................... 16 9.1Features ..................................................................................................................16 9.2Overview .................................................................................................................16 10 System Clock and Clock options ......................................................... 18 10.1Features ................................................................................................................18 i 8068T-AVR-12/10 10.2Overview ...............................................................................................................18 10.3Clock Options ........................................................................................................19 11 Power Management and Sleep Modes ................................................. 21 11.1Features ................................................................................................................21 11.2Overview ...............................................................................................................21 11.3Sleep Modes .........................................................................................................21 12 System Control and Reset .................................................................... 23 12.1Features ................................................................................................................23 12.2Resetting the AVR .................................................................................................23 12.3Reset Sources .......................................................................................................23 13 WDT - Watchdog Timer ......................................................................... 24 13.1Features ................................................................................................................24 13.2Overview ...............................................................................................................24 14 PMIC - Programmable Multi-level Interrupt Controller ....................... 25 14.1Features ................................................................................................................25 14.2Overview ...............................................................................................................25 14.3Interrupt vectors ....................................................................................................25 15 I/O Ports .................................................................................................. 27 15.1Features ................................................................................................................27 15.2Overview ...............................................................................................................27 15.3I/O configuration ....................................................................................................27 15.4Input sensing .........................................................................................................30 15.5Port Interrupt .........................................................................................................30 15.6Alternate Port Functions ........................................................................................30 16 T/C - 16-bits Timer/Counter with PWM ................................................. 31 16.1Features ................................................................................................................31 16.2Overview ...............................................................................................................31 17 AWEX - Advanced Waveform Extension ............................................. 33 17.1Features ................................................................................................................33 17.2Overview ...............................................................................................................33 18 Hi-Res - High Resolution Extension ..................................................... 34 18.1Features ................................................................................................................34 18.2Overview ...............................................................................................................34 ii XMEGA A3 8068T-AVR-12/10 XMEGA A3 19 RTC - Real-Time Counter ...................................................................... 35 19.1Features ................................................................................................................35 19.2Overview ...............................................................................................................35 20 TWI - Two Wire Interface ....................................................................... 36 20.1Features ................................................................................................................36 20.2Overview ...............................................................................................................36 21 SPI - Serial Peripheral Interface ............................................................ 37 21.1Features ................................................................................................................37 21.2Overview ...............................................................................................................37 22 USART ..................................................................................................... 38 22.1Features ................................................................................................................38 22.2Overview ...............................................................................................................38 23 IRCOM - IR Communication Module .................................................... 39 23.1Features ................................................................................................................39 23.2Overview ...............................................................................................................39 24 Crypto Engine ........................................................................................ 40 24.1Features ................................................................................................................40 24.2Overview ...............................................................................................................40 25 ADC - 12-bit Analog to Digital Converter ............................................. 41 25.1Features ................................................................................................................41 25.2Overview ...............................................................................................................41 26 DAC - 12-bit Digital to Analog Converter ............................................. 43 26.1Features ................................................................................................................43 26.2Overview ...............................................................................................................43 27 AC - Analog Comparator ....................................................................... 44 27.1Features ................................................................................................................44 27.2Overview ...............................................................................................................44 27.3Input Selection .......................................................................................................46 27.4Window Function ...................................................................................................46 28 OCD - On-chip Debug ............................................................................ 47 28.1Features ................................................................................................................47 28.2Overview ...............................................................................................................47 29 Program and Debug Interfaces ............................................................. 48 iii 8068T-AVR-12/10 29.1Features ................................................................................................................48 29.2Overview ...............................................................................................................48 29.3IEEE 1149.1 (JTAG) Boundary-scan ....................................................................48 30 Pinout and Pin Functions ...................................................................... 49 30.1Alternate Pin Function Description ........................................................................49 30.2Alternate Pin Functions .........................................................................................51 31 Peripheral Module Address Map .......................................................... 56 32 Instruction Set Summary ...................................................................... 57 33 Packaging information .......................................................................... 61 33.164A ........................................................................................................................61 33.264M2 .....................................................................................................................62 34 Electrical Characteristics ...................................................................... 63 34.1Absolute Maximum Ratings* .................................................................................63 34.2DC Characteristics ................................................................................................63 34.3Operating Voltage and Frequency ........................................................................65 34.4Flash and EEPROM Memory Characteristics .......................................................66 34.5ADC Characteristics ..............................................................................................67 34.6DAC Characteristics ..............................................................................................68 34.7Analog Comparator Characteristics .......................................................................68 34.8Bandgap Characteristics .......................................................................................68 34.9Brownout Detection Characteristics ......................................................................69 34.10PAD Characteristics ............................................................................................69 34.11POR Characteristics ............................................................................................70 34.12Reset Characteristics ..........................................................................................70 34.13Oscillator Characteristics .....................................................................................70 35 Typical Characteristics .......................................................................... 72 35.1Active Supply Current ............................................................................................72 35.2Idle Supply Current ................................................................................................75 35.3Power-down Supply Current .................................................................................79 35.4Power-save Supply Current ..................................................................................80 35.5Pin Pull-up .............................................................................................................80 35.6Pin Output Voltage vs. Sink/Source Current .........................................................82 35.7Pin Thresholds and Hysteresis ..............................................................................85 35.8Bod Thresholds .....................................................................................................87 iv XMEGA A3 8068T-AVR-12/10 35.9Oscillators and Wake-up Time ..............................................................................88 35.10Module current consumption ...............................................................................91 35.11Reset Pulsewidth .................................................................................................92 35.12PDI Speed ...........................................................................................................92 36 Errata ....................................................................................................... 93 36.1ATxmega256A3 .....................................................................................................93 36.2ATxmega192A3, ATxmega128A3, ATxmega64A3 .............................................110 37 Datasheet Revision History ................................................................ 124 37.18068T - 12/10 .....................................................................................................124 37.28068S - 09/10 .....................................................................................................124 37.38068R - 08/10 .....................................................................................................124 37.48068Q - 02/10 .....................................................................................................125 37.58068P - 02/10 .....................................................................................................125 37.68068O - 11/09 .....................................................................................................125 37.78068N - 10/09 .....................................................................................................125 37.88068M - 09/09 ....................................................................................................125 37.98068L - 06/09 .....................................................................................................126 37.108068K - 02/09 ...................................................................................................126 37.118068J - 12/08 ....................................................................................................126 37.128068I - 11/08 ....................................................................................................126 37.138068H - 10/08 ...................................................................................................126 37.148068G - 09/08 ...................................................................................................126 37.158068F - 08/08 ...................................................................................................127 37.168068E - 08/08 ...................................................................................................127 37.178068D - 06/08 ...................................................................................................127 37.188068C - 06/08 ...................................................................................................127 37.198068B - 06/08 ...................................................................................................127 37.208068A - 02/08 ...................................................................................................128 Table of Contents....................................................................................... i Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: (+1)(408) 441-0311 Fax: (+1)(408) 487-2600 www.atmel.com Atmel Asia Limited Unit 1-5 & 16, 19/F BEA Tower, 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Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. 8068T-AVR-12/10