PICDEMPIC18 datasheet(32/38 Pages) MICROCHIP

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PICDEM™ PIC18 Explorer Demonstration Board User’s Guide

DS51721B-page 28

A.1.5

Switches

The following switches are available:

• S1 – Active-low switch connected to RB0

• S2 – Active-low switch connected to RA5

• S3 – MCLR to hard reset the processor

• S4 – MCLR select switch.

If the on board, PIC18F8722 microcontroller is being used, set this to PIC MCU.

If an alternate, PIM-mounted microcontroller is being used, set this to ICE.

A.1.6

Oscillator Options

The main oscillator uses a 10 MHz crystal (Y1) which serves as the controller’s primary

oscillator. A second circuit, using a 32.768-kHz (watch type) crystal (Y2), functions as

the Timer1 oscillator, the source for the Real-Time Clock/Calendar (RTCC) and

secondary oscillator.

The PIC18LF2450, the heart of the RS-232 to USB conversion, is independently

clocked with its own 12 MHz crystal (Y3).

A.1.7

Analog Input (Potentiometer)

A 10 k

Ω potentiometer is connected through a series resistor to AN0. To provide an

analog input to one of the controller’s Analog-to-Digital (A/D) channels, the

potentiometer can be adjusted from VDD to GND.

A.1.8

ICD Connector

Microchip’s low-cost, in-circuit debugger, MPLAB ICD 2, can be connected to the

modular connector (J10). The ICD connector utilizes RB6 and RB7 for in-circuit

debugging.

A.1.9

PICkit™ 2 Connector

Microchip’s low-cost programmer, PICkit 2, can be connected to the 6-pin interface

provided by J12.

A.1.10

Temperature Sensor

The analog thermal sensor, MCP9701A (U1), is used for monitoring temperature. The

device is connected to the Analog-to-Digital Converter (A/D) module through RA1.

A.1.11

Serial EEPROM

A 25LC256, 256 Kbit (32K x 8) serial EEPROM (U9) is included for nonvolatile storage

of firmware.

The EEPROM also can demonstrate the operation of the Serial Peripheral Interface

(SPI) bus. The EEPROM is enabled or disabled from the SPI bus by jumper JP2.

A.1.12

PICtail™ Daughter Board Connector

The PICtail™ interface enables the PICDEM PIC18 Explorer Demonstration Board to

be connected directly to available PICtail daughter board cards. This provides a

one-to-one connection between the microcontrollers and the cards through SPI/I2C™

interfaces.

Note:

For details, see Section 2.4.1 “Programming Requirements”.

Note:

For details, see Section 2.4.1 “Programming Requirements”.

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