Example Of A/D Conversion Program - NEC PD17062 Datasheet

19.6 EXAMPLE OF A/D CONVERSION PROGRAM

The following example shows an A/D conversion program based on the successive comparison method.
The result of conversion is held in the DBF0.
Sample program
DBF0B3 FLG 0.0FH.3
DBF0B2 FLG 0.0FH.2
DBF0B1 FLG 0.0FH.1
DBF0B0 FLG 0.0FH.0
START:
BANK0
INITFLG DBF0B3, NOT DBF0B2, NOT DBF0B1, NOT DBF0B0 ; Sets DBF data.
PUT ADCR, DBF
SKT1 ADCCMP
CLR1 DBF0B3
SET1 DBF0B2
PUT ADCR, DBF
SKT1 ADCCMP
CLR1 DBF0B2
SET1 DBF0B1
PUT ADCR, DBF
SKT1 ADCCMP
CLR1 DBF0B1
SET1 DBF0B0
PUT ADCR, DBF
SKT1 ADCCMP
CLR1 DBF0B0
END:
Number of steps in the conversion loop : 17
Conversion time : 34 s (not in DMA mode)
Conversion time : 204 s (in DMA mode)
PD17062
; Sets reference voltage.
; Judges comparison result.
; DBF0B3 0
; DBF0B2 1
; Sets reference voltage.
; Judges comparison result.
; DBF0B2 0
; DBF0B1 1
; Sets reference voltage.
; Judges comparison result.
; DBF0B1 0
; DBF0B0 1
; Sets reference voltage.
; Judges comparison result.
; DBF0B0 0
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