163
16-Bit 2-State Access Space: Figures 7-7 to 7-9 show bus timings for a 16-bit 2-state access
space. When a 16-bit access space is accessed, the upper half (D15 to D8) of the data bus is used
for the even address, and the lower half (D7 to D0) for the odd address.
Wait states cannot be inserted.
Bus cycle
T
1
T
2
Address bus
ø
AS
RD
D15 to D8
Valid
D7 to D0
Invalid
Read
HWR
D15 to D8
Valid
D7 to D0
High impedance
Write
LWR
High
Figure 7-7 Bus Timing for 16-Bit 2-State Access Space (1) (Even Address Byte Access)
Summary of Contents for H8S/2645
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