12F683 datasheet(36/148 Pages) MICROCHIP

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PIC12F683

DS41211B-page 34

Preliminary

 2004 Microchip Technology Inc.

EXAMPLE 4-2:

ULTRA LOW-POWER

WAKE-UP INITIALIZATION

4.2.4

PIN DESCRIPTIONS AND DIAGRAMS

Each GPIO pin is multiplexed with other functions. The

pins and their combined functions are briefly described

here. For specific information about individual functions

such as the comparator or the A/D, refer to the

appropriate section in this data sheet.

4.2.4.1

GP0/AN0/CIN+/ICSPDAT/ULPWU

Figure 4-1 shows the diagram for this pin. The GP0 pin

is configurable to function as one of the following:

• a general purpose I/O

• an analog input for the A/D

• an analog input to the comparator

• an analog input to the Ultra Low-Power Wake-up

• In-Circuit Serial Programming data

FIGURE 4-1:

BLOCK DIAGRAM OF GP0

BCF

STATUS,RP0

;Bank 0

BSF

GPIO,0

;Set GP0 data latch

MOVLW

H’7’

;Turn off

MOVWF

CMCON0

; comparator

BSF

STATUS,RP0

;Bank 1

BCF

ANSEL,0

;GP0 to digital I/O

BCF

TRISIO,0

;Output high to

CALL

CapDelay

; charge capacitor

BSF

PCON,ULPWUE

;Enable ULP Wake-up

BSF

IOC,0

;Select GP0 IOC

BSF

TRISIO,0

;GP0 to input

MOVLW

B’10001000’

;Enable interrupt

MOVWF

INTCON

; and clear flag

SLEEP

;Wait for IOC

I/O pin

VDD

VSS

VDD

Weak

RD GPIO

IOC

Interrupt-on-

To Comparator

Analog

Input Mode(1)

GPPU

Analog

Input Mode(1)

Change

IULP

WPU

Data Bus

WPU

GPIO

TRISIO

GPIO

Note

Comparator mode and ANSEL determines Analog Input mode.

ULPWUE

VSS

To A/D Converter

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