
228
Chapter 5
Bus Control Function
User’s Manual U16702EE3V2UD00
(2)
Write cycle
Figure 5-11:
Bus Write Timing (Bus Size: 16 bit, 16-bit Access)
Note:
WR0 and WR1 output a low level as shown in the above timing chart when target data access is
performed. At all other times, these pins output a high level.
Remarks: 1.
The circles indicate the sampling timing when 0 is set for the programmable wait.
2.
The broken line indicates high impedance.
In the case of
8-bit access
Odd address
Even address
AD15 to AD8
Data
Undefined
AD7 to AD0
Undefined
Data
WR1, WR0
01
10
CLKOUT
T1
T2
T3
T1
T2
TW
TW
T3
TI
T1
AD15-AD0
ASTB
CSn
WAIT
A1
D1
A2
D2
A3
IDLE
state
Programmable
wait
External
wait
WR1-WR0
00
00
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