PIC16F684-ESLASHP datasheet(42/164 Pages) MICROCHIP

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PIC16F684

DS41202C-page 40

Preliminary

 2004 Microchip Technology Inc.

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 A/D converter or compara-

tor. For specific information about individual functions

such as the Enhanced CCP or the A/D, refer to the

appropriate section in this data sheet.

EXAMPLE 4-3:

INITIALIZING PORTC

4.3.1

RC0/AN4/C2IN+

The RC0 is configurable to function as one of the

following:

• a general purpose I/O

• an analog input for the A/D Converter

• an analog input to the comparator

4.3.2

RC1/AN5/C2IN-

The RC1 is configurable to function as one of the

following:

• a general purpose I/O

• an analog input for the A/D Converter

• an analog input to the comparator

FIGURE 4-7:

BLOCK DIAGRAM OF RC0

AND RC1

Note:

The ANSEL (91h) and CMCON0 (19h)

registers must be initialized to configure

an analog channel as a digital input. Pins

configured as analog inputs will read ‘0’.

BCF

STATUS,RP0

;Bank 0

CLRF

PORTC

;Init PORTC

MOVLW

07h

;Set RC<4,1:0> to

MOVWF

CMCON0

;digital I/O

BSF

STATUS,RP0

;Bank 1

CLRF

ANSEL

;digital I/O

MOVLW

0Ch

;Set RC<3:2> as inputs

MOVWF

TRISC

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

;as outputs

BCF

STATUS,RP0

;Bank 0

I/O PIN

VDD

VSS

Data Bus

PORTC

TRISC

To A/D Converter

PORTC

Analog Input

Mode(1)

To Comparators

Note

Analog Input mode comes from ANSEL or

Comparator mode.

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