Hardware manual

Microcomputer Technical Q&A
48
Q&A No.: QAH8S-040
Category: Bus Controller
Subject: Internal I/O Register Access when Bus is Released
Question
When the H8S/2000 CPU releases the bus to an external device, can the external device (bus
master) access H8S Series internal registers?
Answer
No, internal I/O registers cannot be accessed by an external device.
Applicable Products
Applicability Series Applicability Series Applicability Series
Entire H8S Series Yes H8S/2655 Yes H8S/2350
Yes H8S/2355 Yes H8S/2357 Yes H8S/2345
Yes H8S/2245 H8S/2148 H8S/2144
H8S/2138 H8S/2134 H8S/2128
H8S/2124 — — — —