
PIC16F8X
DS30430C-page 22
1998 Microchip Technology Inc.
TABLE 5-1
PORTA FUNCTIONS
TABLE 5-2
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
Legend: x = unknown, u = unchanged, - = unimplemented read as ’0’. Shaded cells are unimplemented, read as ’0’