SH7014 datasheet(416/754 Pages) RENESAS

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13. High Speed A/D Converter

⎯ SH7014 ⎯

Rev.5.00 Sep. 27, 2007 Page 382 of 716

REJ09B0398-0500

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 high

speed A/D converter is temporarily halted. With the high speed 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.

Figure 13.6 shows an example of operation in the group-scan mode when AN0 to AN2 are

selected.

ADDRB

ADDRA

Channel 3

Channel 2

Channel 1

Channel 0

ADST

ADF

ADDRC

ADDRD

Sam-

pling

Sam-

pling

Sam-

pling

Conver-

sion

standby

Conversion standby

Sam-

pling

Sam-

pling

Sam-

pling

A/D

conver-

sion 1

A/D

conver-

sion 4

A/D

conver-

sion 2

A/D

conver-

sion 5

A/D

conver-

sion 3

Conversion

standby

Conversion standby

Conver-

sion

standby

Conver-

sion

standby

Cleared to 0 by software

Set to 1 by software

Conversion result 1

Conversion result 4

Conversion result 5

Conversion result 2

Conversion result 3

Conver-

sion

stopped

Figure 13.6 High Speed A/D Converter Operation Example (Group-Scan Mode)

SH7014 Datasheet(PDF) 416 Page - Renesas Technology Corp

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