HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 189
HD6417034B
Manufacturer Part Number
HD6417034B
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417034B.pdf
(687 pages)
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A high-level duty of 35% or 50% can be selected for the RD signal using the RD duty bit
(RDDTY) in BCR. When RDDTY is 1, the high-level duty is 35% of the T3 or T w state,
lengthening the access time for external devices.
8.6.2
When the address/data multiplexed I/O space is accessed, the WAIT pin input signal is sampled
and a wait state inserted whenever a low level is detected, regardless of the WCR setting. Figure
8.33 shows an example in which a WAIT signal causes one wait state to be inserted.
Read
Write
Figure 8.33 Wait State Timing For Address/Data Multiplexed I/O Space Access
Wait State Control
WRH, WRL
AD15–AD0
AD15–AD0
A21–A0
WAIT
RD
CK
CS
AH
T1
Address
Address
T2
T3
Rev. 7.00 Jan 31, 2006 page 163 of 658
Section 8 Bus State Controller (BSC)
(wait state)
Tw
Data (output)
Data (input)
REJ09B0272-0700
T4
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