A/D Converter Operation; A/D Converter Basic Operation - NEC V850E/IA1 mPD703116 User Manual

32-bit single-chip microcontrollers

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13.5 A/D Converter Operation

A/D conversion is performed using the following procedure.

(1) Set the analog input selection and the operation mode and trigger mode specifications using the ADSCM00

or ADSCM10 register

in A/D trigger mode or A/D trigger polling mode starts A/D conversion. In timer trigger mode or external

trigger mode, the status becomes trigger standby

(2) When A/D conversion starts, compare the analog input to the voltage generated by the D/A converter.

(3) When 10-bit comparison terminates, store the conversion result in the ADCR0n or ADCR1n register. When

the specified number of A/D conversions have terminated, generate an A/D conversion termination interrupt

(INTAD0, INTAD1) (n = 0 to 7).

If the ADSCM00 or ADSCM10 register is overwritten with the same value during A/D conversion, the

A/D conversion operation preceding the overwrite stops and the conversion result is not stored in the

ADCR0n or ADCR1n register. The conversion operation is initialized and conversion starts from the

In timer trigger mode or external trigger mode, there is a transition to trigger standby status when the

ADCE0 or ADCE1 bit of the ADSCM00 or ADSCM10 register is set to 1. A/D conversion operation is

activated by a trigger signal and there is a return to trigger standby status when A/D conversion

operation terminates.

The timer trigger is selected by the ITRG0 register.

CHAPTER 13 A/D CONVERTER

. Setting (1) the ADCE0 or ADCE1 bit of the ADSCM00 or ADSCM10 register when

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