Panasonic MN103001G/F01K - Manual (Page 390)

I/O Ports
15-24
Fig. 15-6-3 Port 4 Block Diagram (P42, P40)
Fig. 15-6-4 Port 4 Block Diagram (P41)
Internal data bus
P4n
(n=2,0)
P4OUT
P4DIR
P4nD
P4nO
P... Represents one bit of each register.
M
P
X
M
P
X
P4nI
P4IN
P4nM
P4MD
SBO0(n=2),
SBT0(n=0)
SBO0 output enable(n=2),
SBT0 output enable (n=0)
SBO0(n=2),
SBT0(n=0)
Internal data bus
P... Represents one bit of each register.
P4OUT
P41O P41
P4DIR
P41D
P41I
P4IN
P41M
P4MD
SBI0