Datasheet

PIC16F84A
DS35007C-page 16  2001-2013 Microchip Technology Inc.
TABLE 4-1: PORTA FUNCTIONS
TABLE 4-2: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Name Bit0 Buffer Type Function
RA0 bit0 TTL Input/output
RA1 bit1 TTL Input/output
RA2 bit2 TTL Input/output
RA3 bit3 TTL Input/output
RA4/T0CKI bit4 ST Input/output or external clock input for TMR0.
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
Power-on
Reset
Value on all
other
RESETS
05h PORTA
— — — RA4/T0CKI RA3 RA2 RA1 RA0 ---x xxxx ---u uuuu
85h TRISA
— — — TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 ---1 1111 ---1 1111
Legend: x = unknown, u = unchanged, - = unimplemented, read as '0'. Shaded cells are unimplemented, read as '0'.