HD6432633 Datasheet, PDF (251/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

8-Bit 3-State Access Space: Figure 7-7 shows the bus timing for an 8-bit 3-state access space.
When an 8-bit access space is accessed, the upper half (D15 to D8) of the data bus is used.
The LWR pin is fixed high. Wait states can be inserted.
Bus cycle
T₁
T₂
T₃
ø
Address bus
CSn
AS
RD
Read D15 to D8
Valid
D7 to D0
HWR
Write
LWR
D15 to D8
D7 to D0
Note: n = 0 to 7
Invalid
High
Valid
High impedance
Figure 7-7 Bus Timing for 8-Bit 3-State Access Space
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