Datasheet

PIC16C55X
DS40143E-page 24 Preliminary  1996-2013 Microchip Technology Inc.
TABLE 5-1: PORTA FUNCTIONS
TABLE 5-2: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Name Bit #
Buffer
Type
Function
RA0 Bit 0 ST Bi-directional I/O port.
RA1 Bit 1 ST Bi-directional I/O port.
RA2 Bit 2 ST Bi-directional I/O port.
RA3 Bit 3 ST Bi-directional I/O port.
RA4/T0CKI Bit 4 ST Bi-directional I/O port or external clock input for TMR0. Output is open
drain type.
Legend: 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
Value on
All Other
RESETS
05h PORTA
— — — RA4 RA3 RA2 RA1 RA0 ---x xxxx ---u uuuu
85h TRISA
— — — TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 ---1 1111 ---1 1111
Legend: — = Unimplemented locations, read as ‘0’, x = unknown, u = unchanged
Note 1: Shaded bits are not used by PORTA.