115
6.3.2 Bus Control Signal Timing
8-Bit, Three-State-Access Areas: Figure 6-3 shows the timing of bus control signals for an 8-bit,
three-state-access area. Wait states can be inserted.
Bus cycle
ø
Address bus
AS
RD
D
7
to D
0
WR
D
7
to D
0
Read
access
Write
access
External address
Valid
Valid
T
1
T
2
T
3
Figure 6-3 Bus Control Signal Timing for 8-Bit, Three-State-Access Area