Datasheet

PIC16C71X
DS30272A-page 26  1997 Microchip Technology Inc.
TABLE 5-1: PORTA FUNCTIONS
TABLE 5-2: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Name Bit# Buffer Function
RA0/AN0 bit0 TTL Input/output or analog input
RA1/AN1 bit1 TTL Input/output or analog input
RA2/AN2 bit2 TTL Input/output or analog input
RA3/AN3/V
REF bit3 TTL Input/output or analog input/VREF
RA4/T0CKI bit4 ST Input/output or external clock input for Timer0
Output is open drain type
Legend: TTL = TTL input, ST = Schmitt Trigger input
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Value on:
POR,
BOR
Value on all
other resets
05h PORTA — — — RA4 RA3 RA2 RA1 RA0 ---x 0000 ---u 0000
85h TRISA — — — PORTA Data Direction Register ---1 1111 ---1 1111
9Fh ADCON1 — — — — — — PCFG1 PCFG0 ---- --00 ---- --00
Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by PORTA.