164
T1
Upper
address bus
Lower
address bus
ø
CSn
AS
Data bus
T2
T1
T1
Full access
RD
Burst access
Note: n = 1 or 0
Figure 4.43 Example of Burst ROM Access Timing (2)
(ASTn = 0, 1-State Burst Cycle)
4.6.3
Wait Control
As with the basic bus interface, either (1) program wait insertion or (2) pin wait insertion using the
WAIT
pin can be used in the initial cycle (full access) on the burst ROM interface. See section
4.4.5, Wait Control.
Wait states cannot be inserted in a burst cycle.
4.6.4
Write Access
When a write access to burst ROM interface space is executed, burst access is interrupted at that
point and the write access is executed in line with the basic bus interface settings.
Write accesses are not performed in burst mode even though burst ROM space is designated.
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