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2001 Microchip Technology Inc. DS39024B-page 19
PICDEM™ 17 DEMONSTRATION
BOARD USER’S GUIDE
12
Chapter 3. Hardware Description
3.1 Introduction
The hardware on the PICDEM 17 demonstration board is simple and is
intended to illustrate the ease of use and capabilities of the PIC17C7XX
family of devices.
3.2 Highlights
This chapter covers the following topics:
• Port Connections
• Push-button Switches
• DIP Switches
• RS-232 Interface
• CAN Bus Interface
• Modular Connectors
3.3 Port Connections
The following bullets list the I/O features and port connections for the
PIC17C7XX devices.
• PORTA<0:1> not used
• PORTA<2:3> used for SPI
™
/I
2
C
™
interface
• PORTA<4:5> used for USART1 interface
• PORTB<0:3> not used
• PORTB<4:5> used for USART2 handshaking interface (CTS:RTS)
• PORTB<6:7> used for SPI/I
2
C interface
• All of PORTC and PORTD are dedicated to the external memory inter-
face
• PORTE<0:2> are used in the external memory interface as ALE, OE,
and WR respectively
• PORTF<0:3> are used as the data lines for the external LCD
• PORTF<4:6> not used
• PORTF<7> used as the register select control line to external LCD
• PORTG<0:1> not used
• PORTG<2> tied to analog ground
• PORTG<3> tied to the +4.096V voltage reference
• PORTG<4:5> not used
• PORTG<6:7> used for USART2 interface
• PORTH<0:7> not used
• PORTJ<0:7> not used
• All V
DDs tied to digital +5V, all VSS tied to digital ground
• AV
DD tied to analog +5V, AVSS tied to analog ground