H8SXSLASH1663M datasheet(1114/1504 Pages) RENESAS

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Section 22 A/D Converter

Rev. 2.00 Sep. 24, 2008 Page 1082 of 1468

REJ09B0412-0200

ADIE

ADST

ADF

ADDRA

ADDRB

ADDRC

ADDRD

Channel 0 (AN0)

operation state

Channel 1 (AN1)

operation state

Channel 2 (AN2)

operation state

Channel 3 (AN3)

operation state

Set*

A/D conversion start

Clear*

Waiting for conversion

Reading A/D conversion result

A/D conversion 1

A/D conversion 2

A/D conversion result 1

A/D conversion result 2

Waiting for

conversion

Note: *

↓ indicates the timing of instruction execution by software.

Figure 22.3 Example of A/D Converter Operation (Single Mode, Channel 1 Selected)

22.4.2

Scan Mode

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

channels up to four or eight*

1 channels. Two types of scan mode are provided, that is , continuous

scan mode where A/D conversion is repeatedly performed and one-cycle scan mode where A/D

conversion is performed for the specified channels for one cycle.

(1)

Continuous Scan Mode

1. When the ADST bit in ADCSR is set to 1 by software, TPU*

1, TMR*2, or an external trigger

input, A/D conversion starts on the first channel in the specified channel group. Consecutive

A/D conversion on a maximum of four channels (SCANE and SCANS = B'10) or on a

maximum of eight channels*

1 (SCANE and SCANS = B'11) can be selected. When

consecutive A/D conversion is performed on four channels, A/D conversion starts on AN0

when CH3 and CH2 of unit 0 = B’00, on AN4 when CH3 and CH2 of units 0 and 1 = B'01.

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