HD6473258P10V Datasheet, PDF (122/301 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

Section 6. Parallel Handshaking Interface
6.1 Overview
In single-chip mode (mode 3), the H8/325 Series chips can interface to another device by parallel
handshaking, using port 3.
6.1.1 Features
• Built-in latch circuits
Data input to port 3 can be latched on the falling edge of the IS signal.
• Strobe signal output
A strobe signal can be output on the OS line when port 3 is written or read.
• Busy signal output
A busy signal is output on the BUSY line from the time when data are latched on the falling edge
of IS until the latched data are read, unlocking the latch.
• Input strobe interrupt
An input strobe interrupt can be generated at the falling edge of the IS signal.
• Recovery from software standby mode
The input strobe interrupt can be used to recover from software standby mode.
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