HD6432621 Hitachi, HD6432621 Datasheet - Page 180

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

7.1.2
Figure 7-1 shows a block diagram of the bus controller.
136
Other features
External bus release function
External bus control signals
BREQ
BACK
BREQO
WAIT
Legend
ABWCR: Bus width control register
ASTCR: Access state control register
BCRH:
BCRL:
WCRH:
WCRL:
Block Diagram
Bus control register H
Bus control register L
Wait control register H
Wait control register L
Figure 7-1 Block Diagram of Bus Controller
controller
Wait
Area decoder
Bus arbiter
controller
Bus
ABWCR
ASTCR
WCRH
WCRL
BCRH
BCRL
CPU bus request signal
DTC bus request signal
CPU bus acknowledge signal
DTC bus acknowledge signal
Internal control
signals
Bus mode signal
Internal
address bus