Datasheet

PIC12F635/PIC16F636/639

4.3 PORTC

PORTC is a general purpose I/O port consisting of 6

bidirectional pins. The pins can be configured for either

digital I/O or analog input to comparator. For specific

information about individual functions, refer to the

appropriate section in this data sheet.

EXAMPLE 4-3: INITIALIZING PORTC

Note: The CMCON0 register must be initialized

to configure an analog channel as a digital

input. Pins configured as analog inputs will

read ‘0’.

BANKSEL PORTC ;

CLRF PORTC ;Init PORTC

MOVLW 07h ;Set RC<4,1:0> to

MOVWF CMCON0 ;digital I/O

BANKSEL TRISC ;

MOVLW 0Ch ;Set RC<3:2> as inputs

MOVWF TRISC ;and set RC<5:4,1:0>

;as outputs

U-0 U-0 R/W-x R/W-x R/W-x R/W-x R/W-0 R/W-0

— — RC5 RC4 RC3 RC2 RC1 RC0

bit 7 bit 0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 7-6 Unimplemented: Read as ‘0’

bit 5-0 RC<5:0>: PORTC General Purpose I/O Pin bits

1 = Port pin is > V

0 = Port pin is < VIL

U-0 U-0 R/W-1 R/W-1 R-1 R/W-1 R/W-1 R/W-1

— — TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0

bit 7 bit 0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown

bit 7-6 Unimplemented: Read as ‘0’

bit 5-0 TRISC<5:0>: PORTC Tri-State Control bits

1 = PORTC pin configured as an input (tri-stated)

0 = PORTC pin configured as an output