
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/VREF
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
9Fh
ADCON1
—
PCFG1
PCFG0
---- --00
Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by PORTA.