HD64F2149YV datasheet(689/1075 Pages) RENESAS

689 / 1075 page

Section 20 A/D Converter

Rev. 3.00 Jan 18, 2006 page 661 of 1044

REJ09B0280-0300

Section 20 A/D Converter

20.1

Overview

The H8S/2169 or H8S/2149 incorporates 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 16 channels of digital input can be selected for

A/D conversion. Since the conversion precision falls when digital input is selected, digital input is

ideal for use by a comparator identifying multi-valued inputs, for example.

20.1.1

Features

A/D converter features are listed below.

• 10-bit resolution

• Eight (analog) or 16 (digital) input channels

• Settable analog conversion voltage range

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

(AVref) as the analog reference voltage

• High-speed conversion

 Minimum conversion time: 13.4 µs per channel (at 10-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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