PIC16C717-I/SS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C717-I/SS

18/20-Pin, 8-Bit CMOS Microcontrollers with 10/12-Bit A/D

Microchip Technology 

PIC16C717/770/771

11.4 A/D Conversions

Example 11-1 shows an example that performs an A/D

conversion. The port pins are configured as analog

inputs. The analog reference VREF+ is the device AVDD

and the analog reference VREF- is the device AVSS. The

A/D interrupt is enabled and the A/D conversion clock

is TRC. The conversion is performed on the AN0

channel.

EXAMPLE 11-1: PERFORMING AN A/D CONVERSION

BCF

PIR1, ADIF

;Clear A/D Int Flag

BSF

STATUS, RP0 ;Select Bank 1

CLRF ADCON1

;Configure A/D Voltage Reference

MOVLW 0x01

MOVWF ANSEL

;disable AN0 digital input buffer

MOVWF TRISA

;RA0 is input mode

BSF

PIE1, ADIE

;Enable A/D interrupt

BCF

STATUS, RP0 ;Select Bank 0

MOVLW 0xC1

;RC clock, A/D is on,

;Ch 0 is selected

MOVWF ADCON0

;

BSF

INTCON, PEIE ;Enable Peripheral

BSF

INTCON, GIE ;Enable All Interrupts

;

; Ensure that the required sampling time for the

; selected input channel has lapsed. Then the

; conversion may be started.

BSF

ADCON0, GO

;Start A/D Conversion

:

;The ADIF bit will be

;set and the GO/DONE bit

:

;cleared upon completion-

;of the A/D conversion.

; Wait for A/D completion and read ADRESH:ADRESL for result.

© 1999 Microchip Technology Inc.

Advanced Information

DS41120A-page 119

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