Scan Mode Operations (External Trigger Scan) - NEC V850E/MS1 UPD703100 User Manual

11.7.2 Scan mode operations (external trigger scan)

The analog inputs specified by the ADM0 register are selected sequentially from the ANI0 pin using the ADTRG
signal as a trigger, and A/D converted. The A/D conversion results are stored in the ADCRn register corresponding to
the analog input (n = 0 to 7).
When the lower 4 channels (ANI0 to ANI3) of the analog input are set so that they are scanned in the ADM0
register, the INTAD interrupt is generated when the number of A/D conversions specified end, and A/D conversion
ends.
When the higher 4 channels (ANI4 to ANI7) of the analog input are set so that they are scanned in the ADM0
register, after the conversion of the lower 4 channels ends, the mode is shifted to the A/D trigger mode, and the
remaining A/D conversions are executed. The conversion results are stored in the ADCRn register corresponding to
the analog input.
Trigger
ADTRG signal
ADTRG signal
ADTRG signal
ADTRG signal
(A/D trigger mode)
When the conversion of all the specified analog inputs ends, the INTAD interrupt is generated and A/D conversion
ends.
When a trigger is input to the ADTRG pin while the CE bit of the ADM0 register is 1, the A/D conversion is started
again.
This is most appropriate for applications that are constantly monitoring multiple analog inputs.
CHAPTER 11 A/D CONVERTER
Analog Input A/D Conversion Result Register
ANI0 ADCR0
ANI1 ADCR1
ANI2 ADCR2
ANI3 ADCR3
ANI4 ADCR4
ANI5 ADCR5
ANI6 ADCR6
ANI7 ADCR7
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