Chapter 4. A/D Demo – PIC16C71
;No interrupts are enabled, so if the program ever reaches here,
;it will be returned with the global interrupts disabled.
Service_int
return ;do not enable global.
;
;
;
;Initializes and sets up the A/D hardware.
;Select ch0 to ch3 as analog inputs, fosc/2 and read ch0.
;
InitializeAD
bsf STATUS,5 ;select pg1
movlw B’00000000’ ;select ch0-ch3...
movwf ADCON1 ;as analog inputs
bcf STATUS,5 ;select pg0
movlw B’11000001’ ;select:RC,ch0..
movwf ADCON0 ;turn on A/D.
clrf ADRES ;clr result reg.
return
;
;This routine is a software delay of 20uS for the a/d setup.
;At 4Mhz clock, the loop takes 2uS, so initialize TEMP with
;a value of 9 to give 18uS, plus the move etc. should result in
;a total time of > 20uS.
SetupDelay
SD
movlw
movwf
decfsz
goto
return
END
.3
TEMP
TEMP, F
SD
? 1999 Microchip Technology Inc.
DS33015C-page 21
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