PIC16F883-ESLASHSO. datasheet(107/338 Pages) MICROCHIP

107 / 338 page

 2006-2012 Microchip Technology Inc.

DS41291G-page 107

PIC16F882/883/884/886/887

9.2.6

A/D CONVERSION PROCEDURE

This is an example procedure for using the ADC to

perform an Analog-to-Digital conversion:

Configure Port:

• Disable pin output driver (See TRIS register)

• Configure pin as analog

Configure the ADC module:

• Select ADC conversion clock

• Configure voltage reference

• Select ADC input channel

• Select result format

• Turn on ADC module

Configure ADC interrupt (optional):

• Clear ADC interrupt flag

• Enable ADC interrupt

• Enable peripheral interrupt

• Enable global interrupt(1)

Wait the required acquisition time(2).

Start conversion by setting the GO/DONE bit.

Wait for ADC conversion to complete by one of

the following:

• Polling the GO/DONE bit

• Waiting for the ADC interrupt (interrupts

enabled)

Read ADC Result

Clear the ADC interrupt flag (required if interrupt

is enabled).

EXAMPLE 9-1:

A/D CONVERSION

Note 1: The global interrupt can be disabled if the

user is attempting to wake-up from Sleep

and resume in-line code execution.

2: See Section 9.3 “A/D Acquisition

Requirements”.

;This code block configures the ADC

;for polling, Vdd and Vss as reference, Frc

clock and AN0 input.

;

;Conversion start & polling for completion

; are included.

;

BANKSEL

ADCON1

;

MOVLW

B’10000000’ ;right justify

MOVWF

ADCON1

;Vdd and Vss as Vref

BANKSEL

TRISA

;

BSF

TRISA,0

;Set RA0 to input

BANKSEL

ANSEL

;

BSF

ANSEL,0

;Set RA0 to analog

BANKSEL

ADCON0

;

MOVLW

B’11000001’ ;ADC Frc clock,

MOVWF

ADCON0

;AN0, On

CALL

SampleTime

;Acquisiton delay

BSF

ADCON0,GO

;Start conversion

BTFSC

ADCON0,GO

;Is conversion done?

GOTO

$-1

;No, test again

BANKSEL

ADRESH

;

MOVF

ADRESH,W

;Read upper 2 bits

MOVWF

RESULTHI

;store in GPR space

BANKSEL

ADRESL

;

MOVF

ADRESL,W

;Read lower 8 bits

MOVWF

RESULTLO

;Store in GPR space

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