User manual

Hardware Details

A.1.13 LCD

An LCD display with two lines, 16 characters each, is connected to the SPI I/O

expander, MCP23S17. The two control lines and eight data lines are connected to the

I/O expander.

The I/O expander has an SPI interface that connects it to the microcontroller.The I/O

expander is disabled or enabled from the SPI by jumper JP3.

A.1.14 Sample Devices

A sample part programmed with a simple program is included in the PICDEM PIC18

Explorer Demonstration Board Kit. The devices’ I/O features and port connections are

listed in Table A-1.

TABLE A-1: SAMPLE DEVICE I/O FEATURES AND CONNECTIONS

Device LEDs

RS-232/

USB

S1 S2 S3 LCD

Pot

EEPROM

Temp

Sensor

ICD/

PICkit™ 2

Y1,

PIC18F8722 RD7:RD0 RC6/RC7 RB0 RA5 MCLR

RC3:RC5 RA0 RC3:RC5 RA1 RB6/RB7 Yes

PIC18F87J11 RD7:RD0 RC6/RC7 RB0 RA5 MCLR RC3:RC5 RA0 RC3:RC5 RA1 RB6/RB7 Yes