r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 308

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller (BSC)
6.9.2
As with the basic bus interface, either program wait insertion or pin wait insertion using the WAIT
pin can be used in the initial cycle (full access) on the burst ROM interface. See section 6.5.4,
Wait Control. Wait states cannot be inserted in a burst cycle.
6.9.3
When a write access to burst ROM 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.
Rev. 1.00 Sep. 19, 2008 Page 278 of 1342
REJ09B0467-0100
Wait Control
Write Access
Upper address bus
Lower address bus
Figure 6.76 Example of Burst ROM Access Timing
Note: n = 1 and 0
Data bus
CSn
RD
AS
(ASTn = 0, 1-State Burst Cycle)
φ
T
1
Full access
T
2
T
Burst access
1
T
1