PIC16C55X
TABLE 5-1:
Name
RA0
RA1
RA2
RA3
RA4/T0CKI
PORTA FUNCTIONS
Bit #
Buffer
Type
Bit 0
ST
Bit 1
ST
Bit 2
ST
Bit 3
ST
Bit 4
ST
Legend: ST = Schmitt Trigger input
Function
Bi-directional I/O port.
Bi-directional I/O port.
Bi-directional I/O port.
Bi-directional I/O port.
Bi-directional I/O port or external clock input for TMR0. Output is open
drain type.
TABLE 5-2: 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
05h
PORTA —
—
—
RA4 RA3 RA2 RA1 RA0
85h
TRISA
—
—
— TRISA4 TRISA3 TRISA2 TRISA1 TRISA0
Legend: — = Unimplemented locations, read as ‘0’, x = unknown, u = unchanged
Note 1: Shaded bits are not used by PORTA.
---x xxxx
---1 1111
Value on
All Other
RESETS
---u uuuu
---1 1111
DS40143D-page 24
Preliminary
2002 Microchip Technology Inc.