Hardware manual

Rev. 3.0, 09/98, page 227 of 361
Section 11 A/D Converter
11.1 Overview
The H8/338 Series includes an analog-to-digital converter module with eight input channels. A/D
conversion is performed by the successive approximations method with 8-bit resolution.
11.1.1 Features
The features of the on-chip A/D module are:
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8-bit resolution
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Eight analog input channels
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Rapid conversion
Conversion time is 12.2µs per channel (minimum) with a 10MHz system clock
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Single and scan modes
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Single mode: A/D conversion is performed once.
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Scan mode: A/D conversion is performed in a repeated cycle on one to four channels.
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Four 8-bit data registers
These registers store A/D conversion results for up to four channels.
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Sample-and-hold function
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External triggering can be selected
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A CPU interrupt (ADI) can be requested at the completion of each A/D conversion cycle.