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6.4.5
Basic Bus Control Signal Timing
8-Bit, Three-State-Access Areas: Figure 6.9 shows the timing of bus control signals for an 8-bit,
three-state-access area. The upper data bus (D
15
to D
8
) is used in accesses to these areas. The
LWR
pin is always high. Wait states can be inserted.
Bus cycle
External address in area n
Valid
Invalid
Valid
Undetermined data
High
φ
Address bus
CS
n
AS
RD
D
15
to D
8
D
7
to D
0
HWR
LWR
D
15
to D
8
D
7
to D
0
Read access
Write access
Note: n = 7 to 0
T
1
T
2
T
3
Figure 6.9 Bus Control Signal Timing for 8-Bit, Three-State-Access Area
Summary of Contents for H8/3008
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