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I/O Ports
15-49
Fig. 15-11-3 Port 9 Block Diagram (P95, P91, P90)
Fig. 15-11-4 Port 9 Block Diagram (P94, P93, P92)
Internal data bus
P... Represents one bit of each register.
P9OUT
P9nO
P9n
(n=5,1,0)
P9DIR
P9nD
P9nI
P9IN
P9nM
P9MD
DK (n=5),
EXMOD1 (n=1),
EXMOD0 (n=0)
Internal data bus
P9OUT
P9nO
M
P
X
P9n
(n=4,3,2)
P9MD
P... Represents one bit of each register.
P9nM
WE1(n=4),
Control signal
from BC
WE0(n=3),
RE(n=2)