HD6432646 Hitachi, HD6432646 Datasheet - Page 196
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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8-Bit 3-State Access Space: Figure 7-6 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.
162
Read
Write
Address bus
D15 to D8
D15 to D8
D7 to D0
D7 to D0
ø
Figure 7-6 Bus Timing for 8-Bit 3-State Access Space
HWR
LWR
RD
AS
T
1
High impedance
Bus cycle
High
T
2
Valid
T
3
Invalid
Valid
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