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129
Bus cycle
External address in area n
Valid
Valid
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
Valid
Valid
Figure 6.16 Bus Control Signal Timing for 16-Bit, Two-State-Access Area (3)
(Word Access)
6.4.6
Wait Control
When accessing external space, the H8/3008 can extend the bus cycle by inserting wait states (T
w
).
There are two ways of inserting wait states: program wait insertion and pin wait insertion using the
WAIT
pin.
Program Wait Insertion: From 0 to 3 wait states can be inserted automatically between the T
2
state and T
3
state on an individual area basis in three-state access space, according to the settings
of WCRH and WCRL.
Summary of Contents for H8/3008
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