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XTAL
ALE
RD#/PSEN#
P0
A17/A16/P2
Figure 13-8. External Code Fetch (Nonpage Mode, One RD#/PSEN# Wait State)
State 1
XTAL
ALE
WR#
P0
A17/A16/P2
Figure 13-9. External Data Write (Nonpage Mode, One WR# Wait State)
State 1
State 2
A7:0
A17/A16/A15:8
State 2
A7:0
A17/A16/A15:8
EXTERNAL MEMORY INTERFACE
State 3
D7:0
State 3
State 4
D7:0
A2812-04
A4174-02
13-9
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