SH7101 datasheet(373/560 Pages) RENESAS

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Section 11 A/D Converter

Rev.1.00 Sep. 18, 2008 Page 339 of 522

REJ09B0069-0100

11.4.2

Continuous Scan Mode

In continuous scan mode, A/D conversion is to be performed sequentially on the specified

channels (four channels maximum in the SH7108 and eight channels maximum in the SH7109).

The operations are as follows.

1. When the ADST bit in ADCR is set to 1 by software, MTU, MMT, or external trigger input,

A/D conversion starts on the channel with the lowest number in the group (AN0, AN1, ...,

AN7).

2. When A/D conversion for each channel is completed, the result is sequentially transferred to

the A/D data register corresponding to each channel.

3. When conversion of all the selected channels is completed, the ADF bit in ADCSR is set to 1.

If the ADIE bit is set to 1 at this time, an ADI interrupt is requested after A/D conversion ends.

Conversion of the first channel in the group starts again.

4. The ADST bit is not cleared automatically. Steps 2 to 3 are repeated as long as the ADST bit

remains set to 1. When the ADST bit is cleared to 0, A/D conversion stops and the A/D

converter enters the idle state.

SH7101 Datasheet(PDF) 373 Page - Renesas Technology Corp