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SYSTEM CONFIGURATION
39
D0
D1
D2
D3
D4
D5
D6
D7
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
MSM74HC373
LATCH
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
ALE
RD
MSM80C154S/MSM83C154S
A0
A1
A2
A3
A4
A5
A6
A7
CS
R/W
76543210
ROM
256W × 8BIT
I/O
WR
Figure 2-28 Connection circuit for external data memory addressed by register R0 or R1