Datasheet

PIC16F526
DS41326E-page 62  2010 Microchip Technology Inc.
EXAMPLE 9-1: PERFORMING AN
ANALOG-TO-DIGITAL
CONVERSION
EXAMPLE 9-2: CHANNEL SELECTION
CHANGE DURING
CONVERSION
REGISTER 9-2: ADRES: A/D CONVERSION RESULTS REGISTER
R/W-X R/W-X R/W-X R/W-X R/W-X R/W-X R/W-X R/W-X
ADRES7 ADRES6 ADRES5 ADRES4 ADRES3 ADRES2 ADRES1 ADRES0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
;Sample code operates out of BANK0
MOVLW 0xF1 ;configure A/D
MOVWF ADCON0
BSF ADCON0, 1 ;start conversion
loop0 BTFSC ADCON0, 1;wait for ‘DONE’
GOTO loop0
MOVF ADRES, W ;read result
MOVWF result0 ;save result
BSF ADCON0, 2 ;setup for read of
;channel 1
BSF ADCON0, 1 ;start conversion
loop1 BTFSC ADCON0, 1;wait for ‘DONE’
GOTO loop1
MOVF ADRES, W ;read result
MOVWF result1 ;save result
BSF ADCON0, 3 ;setup for read of
BCF ADCON0, 2 ;channel 2
BSF ADCON0, 1 ;start conversion
loop2 BTFSC ADCON0, 1;wait for ‘DONE’
GOTO loop2
MOVF ADRES, W ;read result
MOVWF result2 ;save result
MOVLW 0xF1 ;configure A/D
MOVWF ADCON0
BSF ADCON0, 1 ;start conversion
BSF ADCON0, 2 ;setup for read of
;channel 1
loop0 BTFSC ADCON0, 1;wait for ‘DONE’
GOTO loop0
MOVF ADRES, W ;read result
MOVWF result0 ;save result
BSF ADCON0, 1 ;start conversion
BSF ADCON0, 3 ;setup for read of
BCF ADCON0, 2 ;channel 2
loop1 BTFSC ADCON0, 1;wait for ‘DONE’
GOTO loop1
MOVF ADRES, W ;read result
MOVWF result1 ;save result
BSF ADCON0, 1 ;start conversion
loop2 BTFSC ADCON0, 1;wait for ‘DONE’
GOTO loop2
MOVF ADRES, W ;read result
MOVWF result2 ;save result
CLRF ADCON0 ;optional: returns
;pins to Digital mode and turns off
;the ADC module