Section 15 A/D Converter
15.1 Overview
The H8/532 chip includes an analog-to-digital converter module which can be programmed for
input of analog signal on up to eight channels. A/D conversion is performed by the successive
approximations method with 10-bit resolution.
15.1.1 Features
The features of the on-chip A/D module are:
• Eight analog input channels
• Sample and hold circuit
• 10-Bit resolution
• Rapid conversion
Conversion time is 13.8µs per channel (at ø = 10MHz)
• Single and scan modes
— Single mode: A/D conversion is performed once.
— Scan mode: A/D conversion is performed in a repeated cycle on one to four channels.
• Four 16-bit data registers
These registers store A/D conversion results for up to four channels.
• A CPU interrupt (ADI) can be requested at the completion of each A/D conversion cycle.
This interrupt can also be served by the on-chip data transfer controller (DTC), providing a
convenient way to move results into memory.
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