PIC16F870_13 Datasheet, PDF (34/172 Pages) Microchip Technology – 28/40-Pin, 8-Bit CMOS FLASH Microcontrollers

PIC16F870/871
TABLE 4-1: PORTA FUNCTIONS
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 or VREF.
RA4/T0CKI
bit4
ST Input/output or external clock input for Timer0. Output is open drain type.
RA5/AN4
bit5
TTL Input/output or analog input.
Legend: TTL = TTL input, ST = Schmitt Trigger input
TABLE 4-2: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
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 — — RA5 RA4 RA3 RA2 RA1 RA0 --0x 0000 --0u 0000
85h
TRISA
— — PORTA Data Direction Register
--11 1111 --11 1111
9Fh
ADCON1 ADFM —
—
— PCFG3 PCFG2 PCFG1 PCFG0 --0- 0000 --0- 0000
Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'.
Shaded cells are not used by PORTA.
DS30569C-page 34
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