Datasheet

Table Of Contents
Section 6 Bus Controller
Page 110 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
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
DTC bus request signal
DTC bus acknowledge signal
CPU bus acknowledge signal
DMAC bus acknowledge signal
DMAC bus request signal
CPU bus request signal
Legend:
ABWCR: Bus width control register
ASTCR: Access state control register
WCRH, WCRL: Wait control register H, L
BCRH, BCRL: Bus control register H, L
WAIT
Figure 6.1 Block Diagram of Bus Controller