PICDEM-1 User’s Guide
4.5
Source Code – PIC16C71
LIST P=16C71
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TITLE "Single channel A/D (SAD)"
This program is a simple implementation of the PIC16C71’s
A/D. One channel is used (CH0).
The A/D is configured as follows:
Vref = +5V internal.
A/D Osc. = internal RC
A/D Channel = CH0
Hardware for this program is the PICDEM1 board. The program
converts the potentiometer value on CH0 and displays it as
a 8 bit binary value on PORTB.
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#include <P16C71.INC>
;
TEMP
equ
10h
ADIF
ADGO
equ
equ
1
2
;A/D interrupt flag
;A/D enable bit
;
org
0x00
;
;
;
Start
goto
org
goto
org
movlw
movwf
bsf
Start
0x04
Service_int
0x10
B’00000000’
PORTB
STATUS, RP0
;reset vector
;interrupt vector
;set port b as
;all outputs
CLRF
bcf
TRISB
STATUS, RP0
;
/
;
call
Update
InitializeAD
movf
movwf
call
bcf
bsf
Loop
btfsc
goto
goto
;
DS33015C-page 20
ADRES,W
PORTB
SetupDelay
ADCON0,ADIF
ADCON0,ADGO
ADCON0,ADIF
Update
Loop
;get a/d value
;output to port b
;setup time >= 20uS.
;clear int flag
;start new conversion
;a/d done?
;yes then update new value.
;no then keep checking
? 1999 Microchip Technology Inc.
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