PIC16F684T-I Datasheet, PDF (71/192 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers

EXAMPLE 9-1: A/D CONVERSION
;This code block configures the ADC
;for polling, Vdd reference, Frc clock
;and AN0 input.
;
;Conversion start & polling for completion
; are included.
;
BANKSEL ADCON1
;
MOVLW
B’01110000’ ;ADC Frc clock
MOVWF
ADCON1
;
BANKSEL TRISA
;
BSF
TRISA,0
;Set RA0 to input
BANKSEL ANSEL
;
BSF
ANSEL,0
;Set RA0 to analog
BANKSEL ADCON0
;
MOVLW
B’10000001’ ;Right justify,
MOVWF
ADCON0
; Vdd Vref, 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
PIC16F684
© 2007 Microchip Technology Inc.
DS41202F-page 69