PIC32MX datasheet(40/48 Pages) MICROCHIP

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PIC32MX Starter Kit User’s Guide

DS61144D-page 36

4.2.4

Switches

Push-button switches provide the following functionality:

• SW1: Active-low switch connected to RD6

• SW2: Active-low switch connected to RD7

• SW3: Active-low switch connected to RD13

The switches do not have any debounce circuitry and require the use of internal pull-

up resistors; this allows you to investigate debounce techniques. When Idle, the

switches are pulled high (+3.3V). When pressed, they are grounded.

4.2.5

LEDs

The LEDs, RD0 through RD2, are connected to PORTD of the processor. The PORTD

pins are set high to light the LEDs.

4.2.6

Oscillator Options

The installed microcontroller has an oscillator circuit connected to it. The main oscillator

uses an 8 MHz crystal (Y2) and functions as the controller’s primary oscillator. Use of

an external crystal is not required for PIC32 designs. Your design may use the internal

oscillator, if desired.

The PIC18LF4550, at the heart of the USB subsystem, is independently clocked and

has its own 8 MHz crystal (Y1).

4.2.7

120-Pin Modular Expansion Connector

The PIC32MX Starter Kit demo board has been designed with a 120-pin modular

expansion interface, which allows the board to provide basic generic functionality now,

as well as easy extendability to new technologies as they become available.

TABLE 4-1:

STARTER BOARD CONNECTOR PART NUMBERS

Connector

HIROSE Electric PN

Starter Board Connector

FX10A-120P/12-SV1(71)

Application Board Connector

FX10A-120S/12-SV(71)

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