
EXTERNAL BUS TIMING
ST92F124/F150/F250 - ELECTRICAL CHARACTERISTICS
CPUCLK
PORT9/1
PORT0
(READ)
ALE
OEN
(READ)
WEN
(WRITE)
PORT0
(WRITE)
A21 - A8
12
A7-A0
1
3
2
4
17
D7-D0 IN
9
16
8
6
5
13
10
7
11
A7-A0
14
15
D7-D0 OUT
Note : OEN stays high for the whole write cycle and WEN stays high for the whole read cycle.
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