Datasheet

Section 6 Bus Controller
Rev.7.00 Dec. 24, 2008 Page 116 of 698
REJ09B0074-0700
Figure 6.1 shows a block diagram of the bus controller.
Area decorder
Bus
controller
ABWCR
ASTCR
BCRH
BCRL
Internal
address bus
External bus control signals
Chip select signals
BREQ*
BACK*
Internal control
signals
Wait
controller
WCRH
WCRL
Bus mode signal
Internal data bus
Bus arbiter
CPU bus acknowledge signal
DMAC bus acknowledge signal
DMAC bus request signal
CPU bus request signal
WAIT*
Note: * Supported only by the H8S/2218 Group.
Legend:
A
BWCR:
A
STCR:
WCRH, WCRL:
BCRH, BCRL:
Bus width control register
Access state control register
Waite control registers H, L
Bus control registers H, L
Figure 6.1 Block Diagram of Bus Controller