SH7041A datasheet(589/923 Pages) RENESAS

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ADDRB

ADDRA

Channel 3

Channel 2

Channel 1

Channel 0

ADST

ADF

ADDRC

ADDRD

Sampling

A/D

conversion

A/D

conversion

A/D

conversion

Conversion standby

Conversion

standby

Conversion

standby

Conversion

standby

Automatic clear

Set to 1 by software

Conversion result 1

Conversion result 2

Conversion result 3

Figure 15.6 A/D Converter Operation Example (Group-Single Mode)

15.4.4

Group-Scan Mode

Choose group-scan mode when doing repeated A/D conversions for multiple channels. This is

useful when doing continuous monitoring of the analog inputs of multiple channels.

When the ADST bit is set to 1, A/D conversion is started according to the designated conversion

start conditions. The ADST bit is held to 1 until 0 cleared by software. A/D conversion for the

selected input channels is repeated during that interval.

The ADF flag is set to 1 at the completion of the first conversions of all the designated input

channels. At this point, if the ADIE bit is set to 1, an ADI interrupt request is issued, and the A/D

converter is temporarily halted. With the A/D converter in stop mode due to an ADI interrupt

request, conversion is restarted when the ADF flag is cleared to 0. The ADF flag is cleared by

reading the ADCSR, then writing a 0.

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