410-297P-KIT - Digilent - Datasheet.Live

™

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Overview

The Cerebot MX3cK is a microcontroller

development board based on the Microchip

PIC32MX320F128H, a member of the 32-bit

PIC32 microcontroller family. It is compatible

with Digilent’s line of Pmod™ peripheral

modules, and is suitable for use with the

Microchip MPLAB

IDE tools. The Cerebot

MX3cK is also compatible for use with the

chipKIT™ MPIDE development environment.

ChipKIT and MPIDE is a PIC32 based system

compatible with many existing Arduino™ code

examples, reference materials and other

resources.

The Cerebot MX3cK is designed to be easy to

use and suitable for use by anyone from

beginners to advanced users for experimenting

with electronics and embedded control

systems. It is intended to be used with either

the Multi-Platform IDE, (modified Arduino IDE),

MPIDE, or the Microchip MPLAB IDE. The kit

contains everything needed to start developing

embedded applications using the MPIDE. In

order to use the MPLAB IDE, an additional

programming/debugging device, such as a

Microchip PICkit3 is required.

The Cerebot MX3cK provides 42 I/O pins that

support a number of peripheral functions, such

as UART, SPI and I

C™ ports as well as five

pulse width modulated outputs and five

external interrupt inputs. Eleven of the I/O pins

can be used as analog inputs in addition to

their use as digital inputs and outputs.

The Cerebot MX3cK can be powered via USB,

or an external power supply that may be either

an AC-DC power adapter, or batteries.

Specifications

Microcontroller: PIC32MX320F128H

Flash Memory: 128K

RAM Memory: 16K

Operating Voltage: 3.3V

Max Operating Frequency: 80Mhz

Typical operating current: 75mA

Input Voltage (recommended): 7V to 15V

Input Voltage (maximum): 20V

I/O Pins: 42 total

Analog Inputs: 12

Analog input voltage range: 0V to 3.3V

DC Current per pin: +/-18mA

Cerebot MX3cK Reference Manual

www.digilentinc.com page 2 of 23

Programming Tools

The Cerebot MX3cK is designed to be used

with either the Multi-Platform IDE (MPIDE), the

development software environment used with

the chipKIT™ system, or as a more traditional

microcontroller development platform using the

Microchip MPLAB

IDE and development

tools. The Cerebot MX3cK if fully compatible

with Microchip development tools that support

the PIC32 family of microcontrollers.

The Cerebot MX3cK is immediately useable

with the chipKIT MPIDE. Additional hardware

is required to use the Microchip MPLAB tools.

Using the Cerebot MX3cK with the

chipKIT MPIDE

ChipKIT and the MPIDE is a PIC32 based

hardware and software system compatible with

many existing Arduino™ code examples,

reference materials and other resources. The

MPIDE development platform was produced by

modifying the Arduino™ IDE and is fully

backward compatible with the Arduino IDE.

The Cerebot MX3cK board is designed to be

fully compatible with the chipKIT MPIDE

system, version 20111209 or later.

The MPIDE uses a serial communications port

to communicate with a boot loader running in

the target board. The serial port on the MX3cK

board is implemented using an FTDI FT232R

USB serial converter. Before attempting to use

the MPIDE to communicate with the MX3cK,

the appropriate USB device driver must be

installed.

The Cerebot MX3cK board uses a standard

mini-USB connector for connection to a USB

port on the PC. Use a standard USB-A to mini-

B cable (not provided) to connect the board to

an available USB port on the PC.

In the MPIDE, use the “Tools.Board” command

to select the Cerebot MX3cK from the list of

available boards. Use the “Tools.Serial Port”

command to choose the appropriate serial port

from the list of available serial ports on the PC.

When the MPIDE needs to communicate with

the MX3cK board, the board is reset and starts

running the boot loader. The MPIDE then

establishes communications with the boot

loader and downloads the program to the

board.

When the MPIDE opens the serial

communications connection on the PC, the

DTR pin on the FT232R chip is driven low.

This pin is coupled through a capacitor to the

MCLR pin on the PIC32 microcontroller.

Driving the MCLR line low resets the

microcontroller, restarting execution with the

boot loader.

Once the MPIDE has established

communication with the boot loader, it

transfers the user’s program to the boot loader,

which programs it into the flash memory in the

Microcontroller.

The automatic reset action when the serial

communications connection is opened can be

disabled. To disable this operation, remove the

shorting block from jumper JP1. It is also

possible that it will interfere with the operation

of the MPLAB IDE and a Microchip hardware

programmer/debugger. In this case, also, the

shorting block should be removed from JP1.

The shorting block is reinstalled on JP1 to

restore operation with the MPIDE.

Two red LEDs (LD1 and LD2) will blink when

data is being sent or received between the

Cerebot MX3cK and the PC over the serial

connection.

The header connector J3 provides access to

the other serial handshaking signals provided

by the FT232R. Connector J3 is not loaded at

the factory but can be installed by the user to

access these signals.

Cerebot MX3cK Reference Manual

www.digilentinc.com page 3 of 23

Using the Cerebot MX3cK with

Microchip Development Tools

In addition to being used with the MPIDE, the

Cerebot MX3cK can be used as a more

traditional microcontroller development board

using Microchip Development Tools.

The Microchip MPLAB

IDE or the MPLAB

IDE can be used to program and debug code

running on the Cerebot MX3cK board. These

programs can be downloaded from the

Microchip web site. These software suites

include a free evaluation copy of the Microchip

C32 compiler for use with the PIC32

microcontroller family.

When creating a new project, use the

“Configure.Select Device…” menu to specify the

PIC32 device being used. Ensure that the

device is set to PIC32MX320F128H.

Programming and debugging a program on the

Cerebot MX3cK using the MPLAB IDE requires

the use of external programming hardware.

Typically, this will be a Microchip PICkit™3, but

can be any other tool that supports the same

connection interface as the PICkit3 and

supports the PIC32MX3XX processor family.

Connector JP3 on the left side of the board is

used to connect to the Microchip hardware

development tool. This connector is not loaded

at the factory, but can be installed by the user

if desired. The holes for JP3 are staggered so

that a standard, 100mil spaced, 6-pin header

can be press fit to the board without the need

to solder it in place. The connector at JP3 can

be soldered in place if desired for a more

reliable permanent connection.

Typically, a right angle male connector will be

used in JP3 so that a PICkit3 can be attached

coplanar with the Cerebot MX3cK board. If the

connector is loaded from the top, the PICkit3

will be upright (button and LEDs visible).

Alternatively, the connector can be loaded from

the bottom. In this case, the PICkit3 will be

upside down.

If JP3 is loaded from the top, the PICkit3 will

interfere with the USB connector and the

external power connector. A short six-wire

cable can be used between the PICkit3 and

the Cerebot MX3cK. If JP3 is loaded from the

bottom, the PICkit3 won’t interfere with the

USB and external power connectors.

Digilent has a kit available (PICkit3

Programming Cable Kit) that includes all

necessary connectors and the cable for

connecting a PICkit3 to the Cerebot MX3cK.

The MCLR pin on the PIC32 microcontroller is

used by the hardware programming/debugging

interface to reset the processor. This same pin

is used by the USB serial converter to reset the

processor when using the MPIDE. It is possible

that the reset function from the USB serial

interface can interfere with correct operation of

the Microchip programming and debugging

tools. If this happens, jumper JP1 can be used

to disconnect the USB serial converter reset

circuit. Remove the shorting block from JP1 to

disable the reset circuit. If the shorting block

has been removed, it is necessary to reinstall it

on JP1 in order to use the Cerebot MX3cK

board with the MPIDE again.

Using the Microchip development tools to

program the Cerebot MX3cK will erase the

boot loader. To use the board with the chipKIT

MPIDE again, it is necessary to program the

boot loader back onto the board. The

programming file for the boot loader

programmed into the board by Digilent at the

factory is available for download from the

product page for the Cerebot MX3cK on the

Digilent web site. Additionally, the boot loader

source code is available in the chipKIT project

repository at www.github.com/chipKIT32/pic32-

Arduino-Bootloader.

To reprogram the boot loader using MPLAB,

perform the following steps:

• Use the “Configure.Select Device …” menu to

select the PIC32MX320F128H

Cerebot MX3cK Reference Manual

www.digilentinc.com page 4 of 23

• Use the “Programmer.Select Programmer”

menu to select the “PICkit3” or other

hardware programming tool being used.

• Use the “File Import…” dialog box to

navigate to and select the boot loader

programming downloaded from the Digilent

web site. The file name will be something

like: chipKIT_Bootloader_MX3ck.hex

• Use the “Programmer.Program” command to

program all memories on the device.

Additional Reference Documentation

For additional information about the Cerebot

MX3cK board and the use and operation of the

PIC32MX320F128H microcontroller, refer to

the following documents in addition to this

reference manual.

The Cerebot MX3cK Schematic, available on

the Cerebot MX3cK product page on the

Digilent web site: www.digilentinc.com

The PIC32MX3XX/4XX Family Data Sheet and

the PIC32MX Family Reference Manual

available from the Microchip web site:

www.microchip.com

Additional reference material for the chipKIT

MPIDE system is included in the MPIDE

software download, and on-line in the chipKIT

wiki. Help with questions and problems using

the board with the chipKIT MPIDE software

can also be obtained in the chipKIT forums:

www.github.com/chipKIT32 (software

download)

www.chipKIT.org/wiki

www.chipKIT.org/forum

Cerebot MX3cK Reference Manual

www.digilentinc.com page 5 of 23

Board Hardware Description

The following describes the various features of

the Cerebot MX3cK hardware and the

PIC32XM320F128H microcontroller.

Power Supply

The Cerebot MX3cK is designed to be

powered either from USB or from an external

power supply. There is an automatic

switchover circuit that causes the external

supply to be used if both supplies are present.

The power supply section uses two voltage

regulators. The first regulates the external

voltage to 5V to power the VCC5V0 bus. The

second regulates the VCC5V0 bus to 3.3V to

provide power to the VCC3V3 bus that powers

the PIC32 microcontroller.

The 5V voltage regulator, IC2, is normally an

NCP1117. The board is designed to be able to

also use an LM1117, but the NCP1117 is the

part normally used. The NCP1117 is rated for

an output current of 1A (the LM1117 is rated

for 800mA). The dropout voltage of the

NCP1117 is a maximum of 1.2V at the rated

output current (1.3V for the LM1117). There is

a reverse polarity protection diode in the

external power supply circuit. Considering the

diode drop plus the forward drop across the

regulator, the minimum input voltage to the

regulator should be 7V to produce a reliable 5V

output. The absolute maximum input voltage of

both the NCP1117 and the LM1117 is 20V.

The recommended maximum operating

voltage is 15V. For input voltages above 9V,

the regulator will get extremely hot when

drawing high currents. Both the NCP1117 and

the LM1117 have output short circuit protection

and internal thermal protection and will shut

down automatically to prevent damage.

The 3.3V regulator, IC3, is a Microchip

MCP1725. This regulator is rated for a

maximum output current of 500mA. The

absolute maximum input voltage for the

MCP1725 is 6V. This regulator has internal

short circuit protection and thermal protection.

It will get noticeably warm when the current

consumed by the VCC3V3 bus is close to the

500mA maximum.

The 5V power bus, VCC5V0 can be powered

from one of three sources: 1) The USB5V0 bus

when the board is operating under USB power;

2) The output of the on-board 5V regulator

when operating from an external 7V–15V

supply; or 3) Directly from the external supply

when operating from a regulated 5V external

supply and jumper JP2 is in the BYP position.

Switchover from USB power to external power

is done automatically and the external supply

will be used if both are present.

Jumper JP2 is used to route the external

power supply voltage through the on-board 5V

regulator or directly to the VCC5V0 bus,

bypassing the on-board 5V regulator.

Normally, JP2 should be in the REG position.

This routes the external supply through the 5V

regulator. Operation from an externally

regulated 5V supply is accomplished by

placing the jumper in the BYP position.

The forward drop across the MCP1725 is

typically 210mV (350mV max) at 500mA

output. With JP2 in the BYP position, this will

allow correct operation of the 3.3V power

supply from an input voltage down to 3.5V.

This allows powering the board from batteries

and other lower voltage power sources. In this

case, the VCC5V0 power bus will not be

powered at 5V.

NOTE: It is extremely important to observe the

MCP1725 maximum input voltage rating of 6V

when JP2 is in the BYP position. Applying

more than 6V to the external power input with

the jumper in the BYP position can damage the

3.3V regulator and possibly the PIC32

microcontroller as well.

The PIC32 microcontroller is rated to use a

maximum of 75mA of current when operating

at 80Mhz. This allows up to 425mA from the

VCC3V3 bus and up to 925mA from the

VCC5V0 bus to power external devices. The

Cerebot MX3cK Reference Manual

www.digilentinc.com page 6 of 23

combined power used by the VCC5V0 bus and

the VCC3V3 bus should not exceed 925mA.

The Cerebot MX3cK can provide power to any

peripheral modules attached to the Pmod

connectors, JA-JE, and to I

C devices

connected to the I

C daisy chain connector,

J2. Each Pmod connector provides power pins

that can be powered from either the switched

main power bus, VCC5V0, or the regulated

voltage, VCC3V3, by setting the voltage

jumper block to the desired position.

The I

C power connector only provides 3.3V

from the VCC3V3 bus.

It is also possible to power the Cerebot MX3cK

from any one of the Pmod connectors or the

C connector. When powering the board from

a Pmod connector with the power select

jumper in the 5V0 position, a voltage applied at

the Pmod connector will power the VCC5V0

bus and be regulated to 3.3V for the VCC3V3

bus. When powering the board from the I

connector or a Pmod connector with the power

select jumper in the 3V3 position, only the

VCC3V3 bus will be powered and the VCC5V0

bus will not be powered.

Pmod™ Connectors

The Cerebot MX3cK has five connectors for

connecting Digilent Pmod peripheral modules.

The Pmod connectors, labeled JA–JF, are 2x8

right-angle, female pin header connectors.

Each connector has an associated power

select jumper block labeled JPA–JPF.

Digilent Pmods are a line of small peripheral

modules that provide various kinds of I/O

interfaces. The Pmod product line includes

such things as button, switch and LED

modules, connector modules, LCD displays,

high current output drivers, and many others.

There are two styles of Pmod connector: six-

pin and twelve-pin. Both connectors use

standard pin headers with 100mil spaced pins.

The six-pin connectors have the pins in a 1x6

configuration, while the twelve-pin connectors

use a 2x6 configuration. All of the Pmod

connectors on the Cerebot MX3cK are twelve

pin connectors.

The six-pin connectors provide four I/O signals,

ground and a switchable power connection.

The twelve-pin connectors provide eight I/O

signals, two power and two ground pins. The

twelve-pin connectors have the signals

arranged so that one twelve-pin connector is

equivalent to two of the six-pin connectors.

Pins 1–4 and 7–10 are the signal pins, pins 5

and 11 are the ground pins and pins 6 & 12 are

the power supply pins.

The pin numbering that Digilent uses on the

twelve-pin Pmod connectors is non-standard.

The upper row of pins are numbered 1–6, left

to right (when viewed from the top of the

board), and the lower row of pins are

numbered 7–12, left to right. This is in keeping

with the convention that the upper and lower

rows of pins can be considered to be two six-

pin connectors stacked. When viewed from the

end of the connector, pin 1 is the upper right

pin and pin 7 is immediately below it (closer to

the PCB).

Each Pmod connector has an associated

power select jumper. These are used to select

the power supply voltage supplied to the power

supply pin on the Pmod connector. They are

switchable between either the regulated 5V

power supply or the 3.3V main board supply.

Place the shorting block in the 3V3 position for

regulated 3.3V and in the 5V0 position for

regulated 5V. Note that the 5V0 position will

supply the unregulated input supply if the

regulator bypass jumper JP2 is in the BYP

position.

Each signal pin on the Pmod connectors is

connected to an input/output pin on the PIC32

microcontroller. Each pin has a 200 ohm series

resistor and an ESD protection diode. The

series resistor provides short circuit protection

to prevent damaging the I/O block in the

microcontroller if the pin is inadvertently

shorted to VDD or GND, or two outputs are

shorted together. The ESD protection diode

Cerebot MX3cK Reference Manual

www.digilentinc.com page 7 of 23

protects the I/O block from damage due to

electro-static discharge.

Although ESD protection is provided between

the connector pins and the microcontroller

pins, ESD safe handling procedures should be

followed when handling the circuit board. The

pins on the microcontroller and other circuits

on the board are exposed and can be

damaged through ESD when handling the

board.

Digilent Pmod peripheral modules can either

be plugged directly into the connectors on the

Cerebot MX3cK or attached via cables.

Digilent has a variety of Pmod interconnect

cables available.

See the Pinout Tables in Appendices B–D

below for more information about connecting

peripheral modules and other devices to the

Cerebot MX3cK. These tables indicate the

mapping between pins on the PIC32MX320

microcontroller and the pins on the various

connectors.

The PIC32 microcontroller can source or sink a

maximum of 18mA on all digital I/O pins.

However, to keep the output voltage within the

specified input/output voltage range (V

0.4V,

2.4V) the pin current must be restricted to

+7/-12mA. The maximum current that can be

sourced or sunk across all I/O pins

simultaneously is +/-200mA. The maximum

voltage that can be applied to any digital I/O

pin is 5.5V. For more detailed specifications,

refer to the PIC32MX3XX/4XX Data Sheet.

Digital Inputs and Outputs

The Cerebot MX3cK board provides access to

40 of the I/O pins from the PIC32

microcontroller via the Pmod connectors. Two

additional I/O pins can be accessed via the I

connector, J2. Any of the pins on the Pmod or

C connectors can be individually accessed for

digital input or output. Note that when the I

signals on J2 are being used for I

communications, they are not available for

general purpose I/O.

On PIC32 microcontrollers, the input/output

pins are grouped into I/O Ports and are

accessed via peripheral registers in the

microcontroller. There are seven I/O Ports

numbered A–G and each is 16 bits wide.

Depending on the particular PIC32

microcontroller, some of the I/O Ports are not

present, and not all 16 bits are present in all

I/O Ports.

Each I/O Port has four control registers: TRIS,

LAT, PORT, and ODC. The registers for I/O

Port A are named TRISA, LATA, PORTA and

ODCA. The registers for the other I/O Ports are

named similarly.

The TRIS register is used to set the pin

direction. Setting a TRIS bit to 0 makes the pin

an output. Setting the TRIS bit to 1 makes the

pin an input.

The LAT register is used to write to the I/O

Port. Writing to the LAT register sets any pins

configured as outputs. Reading from the LAT

The PORT register is used to read from the I/O

Port. Reading from the PORT register returns

the current state of all of the pins in the I/O

Port. Writing to the PORT register is equivalent

to writing to the LAT register.

PIC32 microcontrollers allow any pin set as an

output to be configured as either a normal

totem-pole output or as an open-drain output.

The ODC register is used to control the output

type. Setting an ODC bit to 0 makes the pin a

normal output and setting it to 1 makes the pin

a open drain output.

Refer to the PIC32MX3XX/4XX Family Data

Sheet, and the PIC32 Family Reference

Manual, Section 12, IO Ports, for more detailed

information about the operation of the I/O Ports

in the microcontroller.

The chipKIT MPIDE system uses logical pin

numbers to identify digital I/O pins on the

Cerebot MX3cK Reference Manual

www.digilentinc.com page 8 of 23

connectors. These pin numbers start with pin 0

and are numbered up consecutively.

On the Cerebot MX3cK, pin numbers 0–39 are

used to access the pins on the Pmod

connectors and pin numbers 40 and 41 are

used for the two signal pins on the I

connector. The pin numbers are assigned so

that connector JA pin 1 (JA-01) is digital pin 0,

JA pin 2 (JA-02) is digital pin 1, and so on.

Pins 0-7 are on connector JA, pins 8-15 on JB,

pins 16-23 on JC, pins 24-31 on JD, and pins

32-39 on JE. Refer to the tables in Appendices

B–D for detailed information about the pin

mapping between Pmod connector, logical pin

number, and PIC32 microcontroller pin number

and pin function.

When using the Cerebot MX3cK with the

chipKIT MPIDE the functions pinMode(),

digitalRead(), and digitalWrite() are used for

digital pin I/O.

The pinMode() function is used to set the pin

direction. Pin direction can be set to: INPUT,

OUTPUT, or OPEN. OPEN is used for open-

drain and implies output.

The digitalRead() and digitalWrite() functions

are used to read or write the pins.

DigitalRead() returns the current state of the

specified pin, and digitalWrite is used to set the

state of an output pin. The pin state can be

either HIGH or LOW.

User LEDs

Two LEDs are provided, LD4 and LD5,

connected to I/O port F bits 0 and 1 (RF00 and

RF01). LATF Bit 0 is connected to LD4 and bit

1 is connected to LD5. The LEDs are turned on

or off by configuring these two pins as outputs

and driving them high or low. Driving the pin

high turns the LED on, driving it low turns it off.

These I/O pins are dedicated to use with the

LEDs and are not available at any connector.

When using the MPIDE and the chipKIT

system, the LEDs are accessed as digital pins

42 (LD4) and 43 (LD5), or preferably, using the

symbols PIN_LED1 and PIN_LED2.

5V Signal Compatibility

The PIC32 microcontroller operates at 3.3V.

And the I/O pins provide 3.3V logic levels. It is

possible, in some circumstances, to use the

Cerebot MX3cK to operate with 5V logic

devices.

There are two issues to consider when dealing

with 5V compatibility for 3.3V logic. The first is

protection of 3.3V inputs from damage caused

by 5V signals. The second is whether the 3.3V

output is high enough to be recognized as a

logic high value by a 5V input.

The digital I/O pins on the PIC32

microcontroller are 5V tolerant. It is safe to

apply 5V logic signals directly to these pins

without risk of damage to the microcontroller.

The analog capable I/O pins on the PIC32 are

not 5V tolerant. The absolute maximum

voltage rating for the analog pins is 3.6V.

Generally, the analog pins are the pins on I/O

port B, however, there are other non-5V

tolerant pins on the device.

Refer to the PIC32MX3XX/4XX Family Data

Sheet for more information about which pins

on the device are 5V tolerant before applying

input signals higher than 3.3V to any pin on the

Cerebot MX3cK board.

If a 5V signal is to applied to a non-5V tolerant

pin, some external means must be used to limit

the applied voltage to 3.6V or less. The

Cerebot MX3cK board provides 200 ohm

series resistors between the microcontroller

pins and the Pmod connector pins. These

resistors are primarily intended to provide short

circuit protection on the outputs, but will also

provide limited protection if a 5V signal is

inadvertently applied to a non-5V tolerant pin.

One technique that can be used to limit and

input voltage to a safe level is to use a 200

ohm series resistor and Shotkey diode

Cerebot MX3cK Reference Manual

www.digilentinc.com page 9 of 23

connected to the 3.3V supply to clamp the

voltage.

The minimum output high voltage of the PIC32

microcontroller is rated at 2.4V when sourcing

12mA of current. When driving a high

impedance input (typical of CMOS logic) the

output high voltage will be close to 3.3V. Some

5V devices will recognize this voltage as a

logic high input, and some won’t. Many 5V

logic inputs will work reliably with 3.3V inputs.

If the 3.3V logic output is not sufficient for 5V

logic input to be reliably seen as a logic high

input signal, some external means must be

used to raise the output level. In some cases, a

pull-up resistor to 5V is sufficient. A pull-up

resistor in the range of 2Kohm–10kOhm can

be used. This technique should not be used

with pins that are not 5V tolerant on the PIC32

microcontroller.

RESET

A reset button is at the upper left corner of the

board. Pressing this button will reset the PIC32

microcontroller.

Cerebot MX3cK Reference Manual

www.digilentinc.com page 10 of 23

PIC32 Peripheral Devices

The following describes the peripheral devices

available in the PIC32MX460F512L

microcontroller and how they are accessed on

the Cerebot MX4cK board.

CPU Clock Source

The PIC32 microcontroller supports numerous

clock source options for the main processor

operating clock. The Cerebot MX3cK uses an

8Mhz external crystal for use with the XT

oscillator option. Oscillator options are

selected via the configuration settings specified

using the #pragma config statement. Use

#pragma config POSCMOD=XT to select the

XT option.

Using the internal system clock phase-locked

loop (PLL), it is possible to select numerous

multiples or divisions of the 8Mhz oscillator to

produce CPU operating frequencies up to

80Mhz. The clock circuit PLL provides an input

divider, multiplier, and output divider. The

external clock frequency (8Mhz) is first divided

by the input divider value selected. This is

multiplied by the selected multiplier value and

then finally divided by the selected output

divider. The result is the system clock,

SYSCLK, frequency. The SYSCLK frequency

is used by the CPU, DMA controller, interrupt

controller and pre-fetch cache.

The values controlling the operating frequency

are specified using the PIC32MX320

configuration variables. These are set using

the #pragma config statement. Use

#pragma config FPLLIDIV to set the input

divider, #pragma config FPLLMUL to set

the multiplication factor and #pragma config

FPLLODIV to set the output divider. Refer to

the PIC32MX3XX/4XX Family Data Sheet and

the PIC32MX Family Reference Manual,

Section 6. Oscillators, for information on how

to choose the correct values, as not all

combinations of multiplication and division

factors will work.

In addition to configuring the SYSCLK

frequency, the peripheral bus clock, PBCLK,

frequency is also configurable. The peripheral

bus clock is used for most peripheral devices,

and in particular is the clock used by the

timers, and serial controllers (UART, SPI, I2C).

The PBLCK frequency is a division of the

SYSCLK frequency selected using #pragma

config FPBDIV. The PBCLK divider can be

set to divide by 1, 2, 4, or 8.

The following example will set up the Cerebot

MX3cK for operation with a SYSCLK frequency

of 80Mhz and a PBCLK frequency of 10Mhz:

#pragma config FNOSC = PRIPLL

#pragma config POSCMOD = XT

#pragma config FPLLIDIV = DIV_2

#pragma config FPLLMUL = MUL_20

#pragma config FPLLODIV = DIV_1

#pragma config FPBDIV = DIV_8

Documentation for the available PIC32

configuration variables can be found in the

PIC32MX Configuration Settings guide. This is

found using the “Help.Topics…” in the MPLAB

IDE. Refer to Appendix E for an example of

setting the configuration variables.

When using the Cerebot MX3cK with the

chipKIT MPIDE software, the clock source is

automatically set by the boot loader and no

action is required.

UART Interface

The PIC32MX320 microcontroller provides two

UART interfaces, UART1 and UART2. The

UARTs can provide either a 2-wire or a 4-wire

asynchronous serial interface. The 2-wire

interface provides receive (RX) and transmit

(TX) pins. The 4-wire interface includes

request-to-send (RTS) and clear-to-send

(CTS) in addition to receive and transmit.

UART1 can be accessed from Pmod connector

JB and UART2 can be accessed from Pmod

connector JC using the following pins:

Cerebot MX3cK Reference Manual

www.digilentinc.com page 11 of 23

• U1CTS JB-01

• U1TX JB-02

• U1RX JB-03

• U1RTS JB-04

• U2CTS JC-01

• U2TX JC-02

• U2RX JC-03

• U2RTS JC-04

Some of the pins on UART1 and SPI1 are

shared on the PIC32 microcontroller. This

means that UART1 and SPI1 can’t both be

used at the same time.

Detailed information about the operation of the

UART peripherals can be found in the PIC32

Family Reference Manual, Section 21, UART.

The USB Serial converter is connected to

UART1. The MPIDE uses this to communicate

with the boot loader. This can also be used for

a serial communications interface between the

Cerebot MX3cK board and other software

running on a PC. Resistors are used to

decouple the USB serial interface and so

UART 1 can also be used via Pmod connector

JB.

Note that when using the MPIDE software,

devices connected to JB can interfere with the

operation of the serial interface and prevent

the MPIDE from successfully downloading

sketches to the board. If this happens,

disconnect the external device from JB until

the sketch has been downloaded and then

reconnect it.

When using the Cerebot MX3cK with the

MPIDE and the chipKIT system, the UARTs

are accessed using the HardwareSerial facility

built into the system. UART1, connector JB, is

accessed using the Serial object and

UART2, connector JC, is accessed using

Serial1.

Serial Peripheral Interface (SPI)

SPI is a four wire synchronous serial interface

and devices can operate as either an SPI

master device or as an SPI slave device. The

four SPI signals are generally called Slave

Select (SS), Master Out Slave In (MOSI),

Master In Slave Out (MISO), and Serial Clock

(SCK). The master device generates SS and

SCK, and the slave device receives SS and

SCK. The SS signal is used to enable the

slave device, and this signal is only significant

for slave devices. A master device can use any

general purpose I/O pin to generate SS to

enable the slave.

The PIC32 microcontroller labels the SPI

signals as: Slave Select (SS), Serial Data Out

(SDO), Serial Data In (SDI), and Serial Clock

(SCK). When the PIC32 microcontroller is

enabled as a master device SDO serves the

purpose of MOSI and SDI serves the purpose

of MISO. When the PIC32 microcontroller is

operating as an SPI slave device, SDI serves

the purpose of MOSI and SDO serves the

purpose of MISO.

The PIC32 microcontroller provides two Serial

Peripheral Interfaces, SPI1 and SPI2. SPI1 is

accessed via Pmod connector JB and SPI2 is

accessed via Pmod connector JE.

• RD9 JB-01 (used for SS output)

• SDO1 JB-02

• SDI1 JB-03

• SCK1 JB-04

• SS2 JE-01

• MOSI JE-02

• MISO JE-03

• SCK2 JE-04

SPI1 is only laid out to support use as an SPI

master. To use SPI1 as a slave device, it is

necessary to use external wiring to connect the

signals appropriately. When using SPI1 as a

slave device, the SS1 signal is obtained from

Pmod connector JD, pin 1 (JD-01).

Cerebot MX3cK Reference Manual

www.digilentinc.com page 12 of 23

SPI2 is laid out on the board for use either as

an SPI master or as an SPI slave device.

Jumpers JP6 & JP8 are used to select

between master and slave. These jumpers

switch the microcontroller signals SDO2 and

SDI2 between the SPI signals MOSI and MISO

at the Pmod connector. Place the shorting

blocks on these jumpers in the M position

when operating as an SPI master and in the S

position when operating as an SPI slave

device.

Detailed information about the operation of the

SPI peripherals can be found in the PIC32

Family Reference Manual, Section 23, Serial

Peripheral Interface.

When using the Cerebot MX3cK with the

MPIDE and the chipKIT system, the SPI ports

are accessed using either the standard chipKIT

SPI library or using the Digilent DSPI library.

The standard SPI library supports access to a

single SPI port, SPI2. This is accessed using

the SPI object.

The DSPI library supports access to both SPI

ports. The DSPI0 object class is used to create

an object used to access the default SPI port,

SPI2, and the DSPI1 object class is used to

access SPI1.

C™ Interface

The Inter-Integrated Circuit (I

) Interface

provides a medium speed (100K or 400K bps)

synchronous serial communications bus. The

C interface provides master and slave

operation using either 7 bit or 10 bit device

addressing. Each device is given a unique

address, and the protocol provides the ability

to address packets to a specific device or to

broadcast packets to all devices on the bus.

Refer to the Microchip PIC32MX3XX/4XX

Family Data Sheet and the PIC32 Family

Reference Manual for detailed information on

configuring and using the I

C interface.

The PIC32MX320 microcontroller provides for

two independent I

C interfaces. The Cerebot

MX3cK is designed to provide dedicated

access to one of these interfaces, I2C1, using

C daisy chain connector J2. The other I

interface, I2C2, can be accessed at pins 2 & 3

on Pmod connector JC.

The I

C daisy chain connector provides two

positions for connecting to the I

C signals,

power and ground. By using two-wire or four-

wire MTE cables (available separately from

Digilent) a daisy chain of multiple Cerebot

MX3cK boards or other I

C-capable boards

can be created.

The I

C bus is an open-collector bus. Devices

on the bus actively drive the signals low. The

high state of the I

C signals is achieved by pull-

up resistors when no device is driving the lines

low. One device on the I

C bus must provide

the pull-up resistors. On the Cerebot MX3cK,

I2C1 provides selectable pull-up resistors that

can be enabled or disabled via jumper blocks

JP1 and JP10, near Pmod connector JA. The

pull-ups are enabled by installing shorting

blocks and are disabled by removing the

shorting blocks. Generally, only one device on

the bus will have the pull-ups enabled.

There are no pull-up resistors provided on the

Cerebot MX3cK for I2C2. If I2C2 is to be used,

external pull-up resistors must be provided.

The operating voltage for the I

C busses on the

Cerebot MX3cK is 3.3V. External pull-up

resistors must be connected to a 3.3V source.

Detailed information about the operation of the

C peripherals can be found in the PIC32

Family Reference Manual, Section 24, Inter-

Integrated Circuit.

When using the Cerebot MX3cK with the

MPIDE and the chipKIT system, the I

interfaces are accessed using the standard

chipKIT Wire library, or the Digilent DTWI

library.

Cerebot MX3cK Reference Manual

www.digilentinc.com page 13 of 23

The Wire library supports a single I

C interface,

I2C1 on J2. This is accessed using the Wire

object.

The DTWI library supports both I

C interfaces.

The DTWI0 object class is used to create an

object for access to I2C1 and the DTWI1 object

class is used to access I2C2.

The pinout of the I

C daisy chain connector is

as follows:

Connector J2. I2C1

• J2-1 – SCL1

• J2-2 – SCL1

• J2-3 – SDA1

• J2-4 – SDA1

• J2-5 – GND

• J2-6 – GND

• J2-7 – BRD_3V3

• J2-8 – BRD_3V3

Analog Inputs

The PIC32MX320 microcontroller provides a

10-bit analog to digital (A/D) converter that

provides up to sixteen analog inputs. The

Cerebot MX3cK board provides access to 11

of them on the Pmod connectors. The

converted values produced by the A/D

converter will be in the range 0–1023.

For detailed information on the operation and

use of the A/D converter, refer to the PIC32

Family Reference Manual, Section 17, 10-bit

AD Converter.

The analog inputs are accessed using the

analogRead() function in the chipKIT MPIDE

software. The analog input pin number is

specified using the symbols A0–A10. The

digital pin numbers for the pin or the numbers

0–10 can also be used, but using the symbols

A0–A10 is recommended.

The following gives the Pmod connector

position, digital pin number, and

microcontroller I/O port and bit number for the

analog inputs:

• A0 – JC-01, digital pin 16, RB8

• A1 – JC-04, digital pin 19, RB14

• A2 – JC-07, digital pin 20, RB0

• A3 – JC-08, digital pin 21, RB1

• A4 – JD-01, digital pin 24, RB2

• A5 – JD-04, digital pin 27, RB9

• A6 – JD-07, digital pin 28, RB12

• A7 – JD-10, digital pin 31, RB13

• A8 – JE-08, digital pin 37, RB5

• A9 – JE-09, digital pin 38, RB4

• A10 – JE-10, digital pin 39, RB3

A/D Converter Reference

The PIC32 microcontroller provides two

reference inputs to the analog to digital

converter. Vref- is used set the lower reference

level and Vref+ is used to set the upper

reference level. These references can be

connected to internal references or external

references using two of the analog input pins.

When the internal references are being used,

Vref- is connected to Vss and Vref+ is

connected to Vdd. This means that the voltage

input range at the analog input pins is 0V–

3.3V. In this case, an input voltage of 0V will

convert to ~0, an input voltage of 1.65V will

convert to ~511, and an input voltage of 3.3V

will convert to ~1023.

Either one, or both, of the references can be

connected to external reference pins. When

this is done, the references can be set to

voltages other than 0V and 3.3V.

If, for example, both references were selected

to use external references, with 1V applied to

Vref- and 2V applied to Vref+, the input voltage

range at the analog input pins would be from

1V to 2V. An applied voltage of 1V would have

a converted value of ~0, 1.5V would have a

converted value of ~511, and 2V would have a

converted value of ~1023.

When both external references are being used,

Vref+ must have a higher voltage applied to in

than Vref-.

Cerebot MX3cK Reference Manual

www.digilentinc.com page 14 of 23

The analog reference input pins are shared

with two of the analog inputs. Vref- is shared

with A3 (AN1/RB1), and Vref+ is shared with

A2 (AN0/RB0). These pins are not available to

be used as analog inputs when being used as

an external reference.

When using the chipKIT MPIDE software, the

use of external analog references is selected

using the analogReference() function. The

following values can be used with

analogReference():

• DEFAULT – Vref- = 0V, Vref+ = 3.3V

• INTERNAL – same as default

• EXTERNAL – Vref- = 0V, Vref+ = voltage

at A2

• EXTMINUS – Vref- = voltage at A3, Vref+ =

3.3V

• EXTPLUSMINUS – Vref- = voltage at A3,

Vref+ = voltage at A2

Timers

The PIC32 microcontroller provides five timers

that can be used for various timing functions.

These timers are each 16 bits wide, although

two pairs, TIMER2/TIMER3 and

TIMER4/TIMER5 can be combined to produce

32 bit wide timers.

A timer consists of a control register, a counter

various modes of operation. The count register

counts cycles of the clock source selected via

the control register. This clock source can be

the peripheral bus clock or a division of the

peripheral bus clock via a pre-scaler divider.

The period register can be used to generate an

interrupt and/or reset the count register when a

pre-determined value is reached.

For detailed information on the operation of the

PIC32 timers, refer to the PIC32 Family

Reference Manual, Section 14, Timers.

Control and operation of the timers is not

explicitly provided in the current version of the

chipKIT MPIDE software. This capability will be

added in a future version of the software.

Timers are used implicitly by various core

functions and libraries, however.

Output Compare

The PIC32 microcontroller provides five output

compare units that can be used to control the

timing of state changes on certain output pins

or to generate pulse width modulated (PWM)

outputs.

Each output compare unit works with a

particular output pin (OC1-OC5). It can be

programmed to control the pin in any of the

following ways:

• PWM output

• Generate continuous pulses

• Generate a single pulse

• Toggle the output pin

• Generate falling edge

• Generate rising edge

The output compare units work in conjunction

with a timer. Either Timer2 or Timer3 can be

used with any of the five output compare units.

Refer to the PIC32 Family Reference Manual,

Section 16, Output Compare for detailed

information on the use of the output compares

units.

When using the chipKIT MPIDE software,

these are accessed using the analogWrite()

function. The digital pin number, or preferably,

the symbols PIN_OC1 through PIN_OC5 are

used to specify the pin. The chipKIT MPIDE

software currently only supports using the

output compare units to generate PWM

outputs. It uses Timer2 to control the output

compares.

The following gives Pmod connector position,

chipKIT pin number, and microcontroller I/O

port and bit number for the output compare

unit’s output pins:

Cerebot MX3cK Reference Manual

www.digilentinc.com page 15 of 23

• OC1 – JC-09, digital pin 23, RD0

• OC2 – JC-10, digital pin 24, RD1

• OC3 – JD-02, digital pin 25, RD2

• OC4 – JD-08, digital pin 29, RD3

• OC5 – JB-09, digital pin 14, RD4

Input Capture

The PIC32 microcontroller provides five input

capture units. An input capture unit works in

conjunction with a timer and monitors the state

of an associated pin. When the pin changes

state, the current value of the timer is captured.

The input capture units can be used with either

Timer2 or Timer3.

The input capture unit can be programmed to

be sensitive to either a rising edge, a falling

edge, or both edges on the input pin. An

interrupt can also be signaled when an input

capture is triggered. Each input capture has a

four level deep fifo that can buffer up to four

capture events.

For detailed information on the operation and

use of the input capture units, refer to the

PIC32 Family Reference Manual, Section 15,

Input Capture.

The following gives the Pmod connector

position, chipKIT pin number, and

microcontroller port and bit number for the

input capture units input pins:

• IC1 – JE-07, digital pin 32, RD08

• IC2 – JB-01, digital pin 8, RD09

• IC3 – JD-03, digital pin 26, RD10

• IC4 – JD-09, digital pin 30, RD11

• IC5 – JB-09, digital pin 14, RD04

Use of the input capture units is not currently

supported in the chipKIT MPIDE software. This

will be added in a future version.

External Interrupts

The PIC32 microcontroller provides five

external interrupt inputs. An external interrupt

input can be used to generate an interrupt to

the microprocessor CPU when the pin changes

state. They can be programmed to interrupt on

a rising edge or a falling edge on the pin.

Refer to the PIC32 Family Reference Manual,

Section 8, Interrupts for more information on

the operation of the external interrupts.

These are accessed using the attachInterrupt()

and detachInterrupt() functions when using the

chipKIT MPIDE software,. The interrupt

number is specified using the numbers 0-4, or

preferably, the symbols EXT_INT0 through

EXT_INT4.

The following gives Pmod connector position,

chipKIT pin number, and microcontroller I/O

port and bit number:

• INT0 – JB-04, digital pin 11, RF6

• INT1 – JE-07, digital pin 36, RD8

• INT2 – JB-01, digital pin 8, RD9

• INT3 – JD-03, digital pin 26, RD10

• INT4 – JD-09, digital pin 30, RD11

RTCC

The PIC32 microcontroller contains a low

frequency oscillator and Real Time

Clock/Calendar, RTCC, circuit that can be

used to maintain time and date information.

The operation of the RTCC requires a

32.768Khz frequency source. The crystal X2

position, just above and on the left of the

PIC32 microcontroller, IC5, is provided for the

user to solder in a 32Khz watch crystal. The

Citizen CFS206-32.768KDZF-UB is a crystal

part that can be used in this location.

Cerebot MX3cK Reference Manual

www.digilentinc.com page 16 of 23

Appendix A: Connector Description and Jumper Settings

Label Description

JA–JE Pmod I/O Connectors

These are used to access the I/O pins on the PIC32 microcontroller.

JPA–JPE Pmod Connector Power Select Jumpers

These are used to select the power supply voltage applied to the Pmod connector.

Place the shorting block in the 3V3 position (away from the board edge) to provide

power from the VCC3V3 bus to the Pmod connector. Place the shorting block in the

5V0 position (nearer the board edge) to provide power from the VCC5V0 bus.

J1 USB Connector

This is a USB-mini B connector used to access the USB serial converter connected

to UART1.

J2 I2C Daisy Chain Connector

This connector provides access to the I

C data signals and board power signals.

Multiple I

C devices can be daisy chained from this connector to create an I

C bus.

J3 Auxiliary USB Serial Converter I/O

This connector provides access to the additional signals: CTS#, DSR#, DCD#, and

RI# provided by the FT232R serial converter. These signals are not used on the

Cerebot MX3cK board. This connector is not loaded at the factory.

J4 External Power Connector

This is a 5.5x2.5mm coaxial power connector used to provide external power to the

board. It is wired as center positive. The maximum recommended operating voltage

is 15V DC.

JP1 USB Serial converter reset disconnect

This jumper is used to disconnect the USB serial converter from the MCLR pin used

to reset the PIC32 microcontroller. The shorting block on this jumper can be removed

if the USB serial converter reset is interfering when using a Microchip development

tool such as a PICkit3™ when debugging under the MPLAB® IDE. The shorting

block must be installed to use the board with the chipKIT MPIDE.

JP2 5V Regulator Bypass

This jumper is used to bypass the on-board 5V regulator. With the jumper in the REG

position, the external voltage applied at J4 is routed through the 5V regulator. If the

jumper is in the BYP position, the on-board 5V regulator is bypassed and the voltage

from J4 is applied directly to the VCC5V0 bus.

JP3 Microchip Development Tool Connector

Install a 6-pin header in this connecter to enable use of Microchip hardware

debugging and programming tools.

JP6, JP8 Pmod connector JE, SPI2 Master/Slave Select

Place shorting blocks in the M position for when operating SPI2 as an SPI master,

place shorting blocks in the S position for operation as an SPI slave.

JP10, JP11 I2C Pullup Resistor Enable

Install shorting blocks on these to enable use of the on-board I

C pullup resistors.

Remove the shorting blocks the disable the on-board pull-up resistors.

Cerebot MX3cK Reference Manual

www.digilentinc.com page 17 of 23

Appendix B: Example of Configuration Values

The following example illustrates setting the configuration values in the PIC32 microcontroller on the

Cerebot MX3cK. The microcontroller configuration should be done in a single source file in the

project, and is typically done in the ‘main’ project source file. This example sets all configuration

values to valid values for the Cerebot MX3cK board. It sets the system clock for processor operation

at 80Mhz, and the peripheral bus at 10Mhz. This example is for use with MPLAB. Configuration

variables are set by the boot loader in the chipKIT MPIDE system.

/* ------------------------------------------------------------ */

/* PIC32 Configuration Settings */

/* ------------------------------------------------------------ */

/* Oscillator Settings

#pragma config FNOSC = PRIPLL // Oscillator selection

#pragma config POSCMOD = XT // Primary oscillator mode

#pragma config FPLLIDIV = DIV_2 // PLL input divider

#pragma config FPLLMUL = MUL_20 // PLL multiplier

#pragma config FPLLODIV = DIV_1 // PLL output divider

#pragma config FPBDIV = DIV_8 // Peripheral bus clock divider

#pragma config FSOSCEN = OFF // Secondary oscillator enable

/* Clock control settings

#pragma config IESO = OFF // Internal/external clock switchover

#pragma config FCKSM = CSDCMD // Clock switching (CSx)/Clock monitor (CMx)

#pragma config OSCIOFNC = OFF // Clock output on OSCO pin enable

/* Other Peripheral Device settings

#pragma config FWDTEN = OFF // Watchdog timer enable

#pragma config WDTPS = PS1024 // Watchdog timer post-scaler

/* Code Protection settings

#pragma config CP = OFF // Code protection

#pragma config BWP = OFF // Boot flash write protect

#pragma config PWP = OFF // Program flash write protect

/* Debug settings

//#pragma config ICESEL = ICS_PGx2 // ICE pin selection

Cerebot MX3cK Reference Manual

www.digilentinc.com page 18 of 23

Appendix C: Connector Pinout Tables

Arranged by Microcontroller Pin Number

PIC32

Pin #

Connector

Pin #

Digital

Pin #

MCU

Port

Bit

PIC32 Signal Name Notes

1 JA-08 5 RE05 PMD5/RE5

2 JA-09 6 RE06 PMD6/RE6

3 JA-10 7 RE07 PMD7/RE7

4 JE-04 35 RG06 SCK2/PMA5/CN8/RG6

5 JE-03 34 RG07 SDI2/PMA5/CN9/RG7 JP6 in M position

6 JE-02 33 RG08 SDO2/PMA3/CN10/RG8 JP8 in M position

7 N/A N/A MCLR

8 JE-01 32 RG09 SS2/PMA2/CN11/RG9

9 N/A N/A VSS

10 N/A N/A VDD

11 JE-08 37 RB05 C1IN+/AN5/CN7/RB5 A8

12 JE-09 38 RB04 C1IN-/AN4/CN6/RB4 A9

13 JE-10 39 RB03 C2IN+/AN3/CN5/RB3 A10

14 JD-01 24 RB02 C2IN-/AN2/SS1/CN4/RB2 A4

15 JC-08 21 RB01 PGC1/AN1/VREF-/CVREF-/CN3/RB1 A3

16 JC-07 20 RB00 PGED1/PMA6/AN0/VREF+/CVREF+/CN2/RB0 A2

17 N/A N/A RB06 PGEC2/AN8/OCFA/RB6

18 N/A N/A RB07 PGED2/AN7/RB7

19 N/A N/A AVDD

20 N/A N/A AVSS

21 JC-01 16 RB08 U2CTS/C1OUT/AN8/RB8 A0

22 JD-04 27 RB09 PMA7/C2OUT/AN9/RB9 A5

23 N/C N/C RB10 TMS/CVREFOUT/PMA13/AN10/RB10

24 N/C N/C RB11 TDO/PMA12/AN11/RB11

25 N/A N/A VSS

26 N/A N/A VDD

27 JD-07 28 RB12 TCK/PMA11/AN12/RB12 A6

28 JD-10 31 RB13 TDI/PMA10/AN13/RB13 A7

29 JC-04 19 RB14 PMALH/PMA1/U2RTS/AN14/RB14 A1

30 N/C N/C RB15 PMALL/PMA0/AN15/OCFB/CN12/RB15

31 JC-03 18 RF04 PMA9/U2RX/SDA2/CN17/RF4

32 JC-02 17 RF05 PMA8/U2TX/SCL2/CN18/RF5

33 JB-02 9 RF03 U1TX/SDO1/RF3

34 JB-03 10 RF02 U1RX/SDI1/RF2

35 JB-04 11 RF06 U1RTS/BCLK1/SCK1/INT0/RF6

36 J2-3,J2-4 40 RG03 SDA1/RG3

37 J2-1,J2-2 41 RG02 SCL1/RG2

Cerebot MX3cK Reference Manual

www.digilentinc.com page 19 of 23

38 N/A N/A VDD

39 N/A N/A RC12 OSC1/CLKI/RC12 X1, system clock

oscillator

40 N/A N/A RC15 OSC2/CLKO/RC15 X1, system clock

oscillator

41 N/A N/A VSS

42 JE-07 36 RD08 IC1/RTCC/INT1/RD8

43 JB-01 8 RD09 IC2/U1CTS/INT2/RD9

44 JD-03 26 RD10 IC3/PMCS2/PMA15/INT3/RD10

45 JD-09 30 RD11 IC4/PMCS1/PMA14/INT4/RD11

46 JC-09 22 RD00 OC1/RD0 PIN_OC1

47 N/A N/A RC13 SOSCI/CN1/RC13 X2, secondary oscillator

48 N/A N/A RC14 SOSCO/T1CK/CN0/RC14 X2, secondary oscillator

49 JC-10 23 RD01 OC2/RD1 PIN_OC2

50 JD-02 25 RD02 OC3/RD2 PIN_OC3

51 JD-08 29 RD03 OC4/RD3 PIN_OC4

52 JB-09 14 RD04 PMWR/OC5/IC5/CN13/RD4 PIN_OC5

53 JB-08 13 RD05 PMRD/CN14/RD5

54 JB-07 12 RD06 CN15/RD6

55 JB-10 15 RD07 CN16/RD7

56 N/A N/A VCAP/VDDcore

57 N/A N/A ENVREG

58 N/A 42 RF00 RF0 PIN_LED1, (LD4)

59 N/A 43 RF01 RF1 PIN_LED2, (LD5)

60 JA-01 0 RE00 PMD0/RE0

61 JA-02 1 RE01 PMD1/RE1

62 JA-03 2 RE02 PMD2/RE2

63 JA-04 3 RE03 PMD3/RE3

64 JA-07 4 RE04 PMD4/RE4

Cerebot MX3cK Reference Manual

www.digilentinc.com page 20 of 23

Arranged by Connector Pin Number and Digital Pin Number

PIC32

Pin #

Connector

Pin #

Digital

Pin #

MCU

Port

Bit

PIC32 Signal Name Notes

60 JA-01 0 RE00 PMD0/RE0

61 JA-02 1 RE01 PMD1/RE1

62 JA-03 2 RE02 PMD2/RE2

63 JA-04 3 RE03 PMD3/RE3

64 JA-07 4 RE04 PMD4/RE4

1 JA-08 5 RE05 PMD5/RE5

2 JA-09 6 RE06 PMD6/RE6

3 JA-10 7 RE07 PMD7/RE7

43 JB-01 8 RD09 IC2/U1CTS/INT2/RD9

33 JB-02 9 RF03 U1TX/SDO1/RF3

34 JB-03 10 RF02 U1RX/SDI1/RF2

35 JB-04 11 RF06 U1RTS/BCLK1/SCK1/INT0/RF6

54 JB-07 12 RD06 CN15/RD6

53 JB-08 13 RD05 PMRD/CN14/RD5

52 JB-09 14 RD04 PMWR/OC5/IC5/CN13/RD4 PIN_OC5

55 JB-10 15 RD07 CN16/RD7

21 JC-01 16 RB08 U2CTS/C1OUT/AN8/RB8 A0

32 JC-02 17 RF05 PMA8/U2TX/SCL2/CN18/RF5

31 JC-03 18 RF04 PMA9/U2RX/SDA2/CN17/RF4

29 JC-04 19 RB14 PMALH/PMA1/U2RTS/AN14/RB14 A1

16 JC-07 20 RB00 PGED1/PMA6/AN0/VREF+/CVREF+/CN2/RB0 A2

15 JC-08 21 RB01 PGC1/AN1/VREF-/CVREF-/CN3/RB1 A3

46 JC-09 22 RD00 OC1/RD0 PIN_OC1

49 JC-10 23 RD01 OC2/RD1 PIN_OC2

14 JD-01 24 RB02 C2IN-/AN2/SS1/CN4/RB2 A4

50 JD-02 25 RD02 OC3/RD2 PIN_OC3

44 JD-03 26 RD10 IC3/PMCS2/PMA15/INT3/RD10

22 JD-04 27 RB09 PMA7/C2OUT/AN9/RB9 A5

27 JD-07 28 RB12 TCK/PMA11/AN12/RB12 A6

51 JD-08 29 RD03 OC4/RD3 PIN_OC4

45 JD-09 30 RD11 IC4/PMCS1/PMA14/INT4/RD11

28 JD-10 31 RB13 TDI/PMA10/AN13/RB13 A7

8 JE-01 32 RG09 SS2/PMA2/CN11/RG9

6 JE-02 33 RG08 SDO2/PMA3/CN10/RG8 JP8 in M position

5 JE-03 34 RG07 SDI2/PMA5/CN9/RG7 JP6 in M position

4 JE-04 35 RG06 SCK2/PMA5/CN8/RG6

42 JE-07 36 RD08 IC1/RTCC/INT1/RD8

11 JE-08 37 RB05 C1IN+/AN5/CN7/RB5 A8

12 JE-09 38 RB04 C1IN-/AN4/CN6/RB4 A9

Cerebot MX3cK Reference Manual

www.digilentinc.com page 21 of 23

13 JE-10 39 RB03 C2IN+/AN3/CN5/RB3 A10

36 J2-3,J2-4 40 RG03 SDA1/RG3

37 J2-1,J2-2 41 RG02 SCL1/RG2

58 N/A 42 RF00 RF0 PIN_LED1, (LD4)

59 N/A 43 RF01 RF1 PIN_LED2, (LD5)

7 N/A N/A MCLR

9 N/A N/A VSS

10 N/A N/A VDD

17 N/A N/A RB06 PGEC2/AN8/OCFA/RB6

18 N/A N/A RB07 PGED2/AN7/RB7

19 N/A N/A AVDD

20 N/A N/A AVSS

25 N/A N/A VSS

26 N/A N/A VDD

38 N/A N/A VDD

39 N/A N/A RC12 OSC1/CLKI/RC12 X1, system clock

oscillator

40 N/A N/A RC15 OSC2/CLKO/RC15 X1, system clock

oscillator

41 N/A N/A VSS

47 N/A N/A RC13 SOSCI/CN1/RC13 X2, secondary oscillator

48 N/A N/A RC14 SOSCO/T1CK/CN0/RC14 X2, secondary oscillator

56 N/A N/A VCAP/VDDcore

57 N/A N/A ENVREG

23 N/C N/C RB10 TMS/CVREFOUT/PMA13/AN10/RB10

24 N/C N/C RB11 TDO/PMA12/AN11/RB11

30 N/C N/C RB15 PMALL/PMA0/AN15/OCFB/CN12/RB15

Cerebot MX3cK Reference Manual

www.digilentinc.com page 22 of 23

Arranged by Microcontroller I/O Port Name and Bit Number

PIC32

Pin #

Connector

Pin #

Digital

Pin #

MCU

Port

Bit

PIC32 Signal Name Notes

16 JC-07 20 RB00 PGED1/PMA6/AN0/VREF+/CVREF+/CN2/RB0 A2

15 JC-08 21 RB01 PGC1/AN1/VREF-/CVREF-/CN3/RB1 A3

14 JD-01 24 RB02 C2IN-/AN2/SS1/CN4/RB2 A4

13 JE-10 39 RB03 C2IN+/AN3/CN5/RB3 A10

12 JE-09 38 RB04 C1IN-/AN4/CN6/RB4 A9

11 JE-08 37 RB05 C1IN+/AN5/CN7/RB5 A8

17 N/A N/A RB06 PGEC2/AN8/OCFA/RB6

18 N/A N/A RB07 PGED2/AN7/RB7

21 JC-01 16 RB08 U2CTS/C1OUT/AN8/RB8 A0

22 JD-04 27 RB09 PMA7/C2OUT/AN9/RB9 A5

23 N/C N/C RB10 TMS/CVREFOUT/PMA13/AN10/RB10

24 N/C N/C RB11 TDO/PMA12/AN11/RB11

27 JD-07 28 RB12 TCK/PMA11/AN12/RB12 A6

28 JD-10 31 RB13 TDI/PMA10/AN13/RB13 A7

29 JC-04 19 RB14 PMALH/PMA1/U2RTS/AN14/RB14 A1

30 N/C N/C RB15 PMALL/PMA0/AN15/OCFB/CN12/RB15

39 N/A N/A RC12 OSC1/CLKI/RC12 X1, system clock

oscillator

47 N/A N/A RC13 SOSCI/CN1/RC13 X2, secondary oscillator

48 N/A N/A RC14 SOSCO/T1CK/CN0/RC14 X2, secondary oscillator

40 N/A N/A RC15 OSC2/CLKO/RC15 X1, system clock

oscillator

46 JC-09 22 RD00 OC1/RD0 PIN_OC1

49 JC-10 23 RD01 OC2/RD1 PIN_OC2

50 JD-02 25 RD02 OC3/RD2 PIN_OC3

51 JD-08 29 RD03 OC4/RD3 PIN_OC4

52 JB-09 14 RD04 PMWR/OC5/IC5/CN13/RD4 PIN_OC5

53 JB-08 13 RD05 PMRD/CN14/RD5

54 JB-07 12 RD06 CN15/RD6

55 JB-10 15 RD07 CN16/RD7

42 JE-07 36 RD08 IC1/RTCC/INT1/RD8

43 JB-01 8 RD09 IC2/U1CTS/INT2/RD9

44 JD-03 26 RD10 IC3/PMCS2/PMA15/INT3/RD10

45 JD-09 30 RD11 IC4/PMCS1/PMA14/INT4/RD11

60 JA-01 0 RE00 PMD0/RE0

61 JA-02 1 RE01 PMD1/RE1

62 JA-03 2 RE02 PMD2/RE2

63 JA-04 3 RE03 PMD3/RE3

64 JA-07 4 RE04 PMD4/RE4

Cerebot MX3cK Reference Manual

www.digilentinc.com page 23 of 23

1 JA-08 5 RE05 PMD5/RE5

2 JA-09 6 RE06 PMD6/RE6

3 JA-10 7 RE07 PMD7/RE7

58 N/A 42 RF00 RF0 PIN_LED1, (LD4)

59 N/A 43 RF01 RF1 PIN_LED2, (LD5)

34 JB-03 10 RF02 U1RX/SDI1/RF2

33 JB-02 9 RF03 U1TX/SDO1/RF3

31 JC-03 18 RF04 PMA9/U2RX/SDA2/CN17/RF4

32 JC-02 17 RF05 PMA8/U2TX/SCL2/CN18/RF5

35 JB-04 11 RF06 U1RTS/BCLK1/SCK1/INT0/RF6

37 J2-1,J2-2 41 RG02 SCL1/RG2

36 J2-3,J2-4 40 RG03 SDA1/RG3

4 JE-04 35 RG06 SCK2/PMA5/CN8/RG6

5 JE-03 34 RG07 SDI2/PMA5/CN8/RG7 JP6 in M position

6 JE-02 33 RG08 SDO2/PMA3/CN10/RG8 JP8 in M position

8 JE-01 32 RG09 SS2/PMA2/CN11/RG9

7 N/A N/A MCLR

9 N/A N/A VSS

10 N/A N/A VDD

19 N/A N/A AVDD

20 N/A N/A AVSS

25 N/A N/A VSS

26 N/A N/A VDD

38 N/A N/A VDD

41 N/A N/A VSS

56 N/A N/A VCAP/VDDcore

57 N/A N/A ENVREG

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