Hitachi H8/300H Series Programming Manual page 256

Read cycle
T state T state
1 2
ø
Address bus Address
AS
RD
Data bus Read data
(two-state access)
Read cycle
T state T state state
T
1 2 3
ø
Address bus
Address
AS
RD
Data bus
Read data
(three-state access)
Figure 4-5 External Device Access Timing (1) Read Timing
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