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Chapter 4. A/D Demo – PIC16C71
The Update routine reads the A/D result register, writes the value it got to the
LEDs connected to PORTB, calls SetupDelay , clears the interrupt flag and
enables the next conversion.
Update
movf
movwf
call
bcf
bsf
ADRES,W
PORTB
SetupDelay
ADCON0,ADIF
ADCON0,ADGO
;get a/d value
;output to port b
;setup time >= 20uS.
;clear int flag
;start new conversion
The SetupDelay routine provides a software delay so that the sample and
hold circuit has enough time to settle before the A/D conversion is started.
The SD loop takes 2 μ s when TEMP is not equal to zero, so a value of nine
loaded into TEMP would provide a delay of 18 μ s. With the 2 μ s execution
time of the two moves before the SD loop and the call and return execution
times, a delay of greater than 20 μ s is provided for settling.
SetupDelay
SD
movlw
movwf
decfsz
goto
.3
TEMP
TEMP, F
SD
return
The Loop routine tests the A/D interrupt flag, and loops until it indicates that
the conversion has finished (ADIF = 0). When the conversion has finished, it
jumps back to Loop so that the A/D value can be read and output to the LEDs.
Loop
btfsc
goto
goto
ADCON0,ADIF
Update
Loop
;a/d done?
;yes then update new value.
;no then keep checking
? 1999 Microchip Technology Inc.
DS33015C-page 19
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