HD6432138SW datasheet(605/1061 Pages) RENESAS

605 / 1061 page

Section 19 A/D Converter

Rev. 4.00 Jun 06, 2006 page 551 of 1004

REJ09B0301-0400

Section 19 A/D Converter

19.1

Overview

The H8S/2138 Group and H8S/2134 Group incorporate a 10-bit successive-approximations A/D

converter that allows up to eight analog input channels to be selected.

In addition to the eight analog input channels, up to 8 channels of digital input can be selected for

A/D conversion. Since the conversion precision falls to the equivalent of 6-bit resolution when

digital input is selected, digital input is ideal for use by a comparator identifying multi-valued

inputs, for example.

19.1.1

Features

A/D converter features are listed below.

• 10-bit resolution

• Eight (analog) or 8 (digital) input channels

• Settable analog conversion voltage range

 The analog conversion voltage range is set using the analog power supply voltage pin

(AVcc) as the analog reference voltage

• High-speed conversion

 Minimum conversion time: 6.7 µs per channel (at 20-MHz operation)

• Choice of single mode or scan mode

 Single mode: Single-channel A/D conversion

 Scan mode:

Continuous A/D conversion on 1 to 4 channels

• Four data registers

 Conversion results are held in a 16-bit data register for each channel

• Sample and hold function

• Three kinds of conversion start

 Choice of software or timer conversion start trigger (8-bit timer), or ADTRG pin

• A/D conversion end interrupt generation

 An A/D conversion end interrupt (ADI) request can be generated at the end of A/D

conversion

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