PIC18F23K22-ESLASHML datasheet(297/496 Pages) MICROCHIP

297 / 496 page

 2010 Microchip Technology Inc.

Preliminary

DS41412C-page 297

PIC18(L)F2X/4XK22

17.2.10

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

• Select acquisition delay

• 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 17-1:

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: Software delay required if ACQT bits are

set to zero delay. See Section 17.3 “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.

;

MOVLW

B’10101111’ ;right justify, Frc,

MOVWF

ADCON2

; & 12 TAD ACQ time

MOVLW

B’00000000’ ;ADC ref = Vdd,Vss

MOVWF

ADCON1

;

BSF

TRISA,0

;Set RA0 to input

BSF

ANSEL,0

;Set RA0 to analog

MOVLW

B’00000001’ ;AN0, ADC on

MOVWF

ADCON0

;

BSF

ADCON0,GO

;Start conversion

ADCPoll:

BTFSC

ADCON0,GO

;Is conversion done?

BRA

ADCPoll

;No, test again

; Result is complete - store 2 MSbits in

; RESULTHI and 8 LSbits in RESULTLO

MOVFF

ADRESH,RESULTHI

MOVFF

ADRESL,RESULTLO

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