PIC16C55X(A)
TABLE 5-1:
PORTA FUNCTIONS
Buffer
Name
Bit #
Type
Function
RA0
bit0
bit1
bit2
bit3
bit4
ST
ST
ST
ST
ST
Input/output
Input/output
Input/output
Input/output
RA1
RA2
RA3
RA4/T0CKI
Input/output or external clock input for TMR0. Output is open drain type.
Legend: ST = Schmitt Trigger input
TABLE 5-2:
SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Value on
POR
Value on
All Other Resets
Address Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
05h
85h
PORTA
TRISA
—
—
—
—
—
—
RA4
RA3
RA2
RA1
RA0
---x xxxx
---1 1111
---u uuuu
---1 1111
TRISA4 TRISA3 TRISA2 TRISA1 TRISA0
Legend: — = Unimplemented locations, read as ‘0’
Note: Note: Shaded bits are not used by PORTA.
DS40143B-page 24
Preliminary
1997 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
