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I/O Ports
15-22
15.6 Port 4
15.6.1 Block Diagram
Figs. 15-6-1 to 15-6-4 show block diagrams for port 4.
Fig. 15-6-1 Port 4 Block Diagram (P45 and P43)
P4n
(n=5,3)
Internal data bus
P4OUT
P4nI
P4IN
P4nM
P4MD
P4DIR
P4nD
P4nO
P... Represents one bit of each register.
P4nS
P4SS
M
P
X
M
P
X
DWE(n=5),
DCAS0(n=3)
SBO1(n=5),
SBT1(n=3)
SBO1(n=5),
SBT1(n=3)
SBO1 output enable (n=5),
SBT1 output enable (n=3)
M
P
X
M
P
X
Control
signal from
BC