r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 231
r4f2456
Manufacturer Part Number
r4f2456
Description
16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R4F2456.pdf
(1376 pages)
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6.5.5
The read strobe (RD) timing can be changed for individual areas by setting bits RDN7 to RDN0 to
1 in RDNCR. Figure 6.19 shows an example of the timing when the read strobe timing is changed
in basic bus 3-state access space.
When the DMAC or EXDMAC is used in single address mode, note that if the RD timing is
changed by setting RDNn to 1, the RD timing will change relative to the rise of DACK or
EDACK.
Read
Write
Notes: 1. Downward arrows indicate the timing of WAIT pin sampling.
Read Strobe (RD) Timing
2. When RDNn = 0
φ
WAIT
Address bus
AS
RD
Data bus
HWR, LWR
Data bus
Figure 6.18 Example of Wait State Insertion Timing
T
1
By program wait
T
2
T
w
Write data
Rev. 1.00 Sep. 19, 2008 Page 201 of 1342
T
By WAIT pin
w
Section 6 Bus Controller (BSC)
T
w
Read data
REJ09B0467-0100
T
3
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