SH7101 datasheet(372/560 Pages) RENESAS

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Section 11 A/D Converter

Rev.1.00 Sep. 18, 2008 Page 338 of 522

REJ09B0069-0100

Bit

Bit Name

Initial Value

R/W

Description

TRG0S1

TRG0S0

R/W

AD Trigger 0 Select 1 and 0

Enable the start of A/D conversion by A/D0 with a

trigger signal.

00: A/D conversion start by external trigger pin

(

ADTRG) or MTU trigger is enabled

01: A/D conversion start by external trigger pin

(

ADTRG) is enabled

10: A/D conversion start by MTU trigger is enabled

11: A/D conversion start by MMT trigger is enabled

When changing the operating mode, first clear the

TRGE and ADST bits in the A/D control registers

(ADCRs) to 0.

11.4

Operation

The A/D converter operates by successive approximation with 10-bit resolution. It has two

operating modes; single mode and scan mode. There are two kinds of scan mode: continuous

mode and single-cycle mode. When changing the operating mode or analog input channel, in order

to prevent incorrect operation, first clear the ADST bit to 0 in ADCR. The ADST bit can be set at

the same time when the operating mode is changed.

11.4.1

Single Mode

In single mode, A/D conversion is to be performed only once on the specified single channel. The

operations are as follows.

1. A/D conversion is started when the ADST bit in ADCR is set to 1, according to software,

MTU, MMT, or external trigger input.

2. When A/D conversion is completed, the result is transferred to the A/D data register

corresponding to the channel.

3. On completion of conversion, the ADF bit in ADCSR is set to 1. If the ADIE bit is set to 1 at

this time, an ADI interrupt request is generated.

4. The ADST bit remains set to 1 during A/D conversion. When A/D conversion ends, the ADST

bit is automatically cleared to 0 and the A/D converter enters the idle state.

When the ADST bit is cleared to 0 during A/D conversion, A/D conversion stops and the A/D

converter enters the idle state.

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