HD6432621 Hitachi, HD6432621 Datasheet - Page 221

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

7.8.5
If MSTPCR is set to H'FFFFFF or H'EFFFFF and a transition is made to sleep mode, the external
bus release function will halt. Therefore, these values should not be set in MSTPCR if the external
bus release function is to be used in sleep mode.
7.9
7.9.1
The H8S/2626 Series and H8S/2623 Series have a bus arbiter that arbitrates bus master operations.
There are two bus masters, the CPU and DTC, which perform read/write operations when they
have possession of the bus. Each bus master requests the bus by means of a bus request signal. The
bus arbiter determines priorities at the prescribed timing, and permits use of the bus by means of a
bus request acknowledge signal. The selected bus master then takes possession of the bus and
begins its operation.
7.9.2
The bus arbiter detects the bus masters’ bus request signals, and if the bus is requested, sends a bus
request acknowledge signal to the bus master making the request. If there are bus requests from
more than one bus master, the bus request acknowledge signal is sent to the one with the highest
priority. When a bus master receives the bus request acknowledge signal, it takes possession of the
bus until that signal is canceled.
The order of priority of the bus masters is as follows:
An internal bus access by an internal bus master, and external bus release, can be executed in
parallel.
In the event of simultaneous external bus release request, and internal bus master external access
request generation, the order of priority is as follows:
Usage Note
Bus Arbitration
Overview
Operation
(High)
(High) External bus release > Internal bus master external access (Low)
DTC
>
CPU
(Low)
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