16F636 datasheet(51/196 Pages) MICROCHIP

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Preliminary

DS41232B-page 49

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

4.3.1

RC0/C2IN+

The RC0 pin is configurable to function as one of the

following:

• a general purpose I/O

• an analog input to the comparator

4.3.2

RC1/C2IN-

The RC1 pin is configurable to function as one of the

following:

• a general purpose I/O

• an analog input to the comparator

FIGURE 4-7:

BLOCK DIAGRAM OF RC0

AND RC1

4.3.3

RC2

The RC2 pin is configurable to function as a general

purpose I/O.

4.3.4

RC3

The RC3 pin is configurable to function as a general

purpose I/O.

4.3.5

RC5

The RC5 pin is configurable to function as a general

purpose I/O.

FIGURE 4-8:

BLOCK DIAGRAM OF

RC2, RC3 AND RC5

Note:

The CMCON0 (19h) register must be ini-

tialized to configure an analog channel as

a digital input. Pins configured as analog

inputs will read ‘0’.

BCF

STATUS,RP0

;Bank 0

BCF

STATUS,RP1

;

CLRF

PORTC

;Init PORTC

MOVLW

07h

;Set RC<4,1:0> to

MOVWF

CMCON0

;digital I/O

BSF

STATUS,RP0

;Bank 1

BCF

STATUS,RP1

MOVLW

0Ch

;Set RC<3:2> as inputs

MOVWF

TRISC

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

;as outputs

BCF

STATUS,RP0

;Bank 0

BCF

STATUS,RP1

;

I/O pin

VDD

VSS

Data Bus

PORTC

TRISC

PORTC

Analog Input

Mode

To Comparators

I/O pin

VDD

VSS

Data Bus

PORTC

TRISC

PORTC

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