NEC PD17062 Manuale Utente
237
µ
PD17062
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
; Sets reference voltage.
SKT1
ADCCMP
; Judges comparison result.
CLR1
DBF0B3
; DBF0B3
←
0
SET1
DBF0B2
; DBF0B2
←
1
PUT
ADCR, DBF
; Sets reference voltage.
SKT1
ADCCMP
; Judges comparison result.
CLR1
DBF0B2
; DBF0B2
←
0
SET1
DBF0B1
; DBF0B1
←
1
PUT
ADCR, DBF
; Sets reference voltage.
SKT1
ADCCMP
; Judges comparison result.
CLR1
DBF0B1
; DBF0B1
←
0
SET1
DBF0B0
; DBF0B0
←
1
PUT
ADCR, DBF
; Sets reference voltage.
SKT1
ADCCMP
; Judges comparison result.
CLR1
DBF0B0
; DBF0B0
←
0
END:
Number of steps in the conversion loop : 17
Conversion time : 34
µ
s (not in DMA mode)
Conversion time : 204
µ
s (in DMA mode)