Panasonic MN101C77C - Manual (Page 170)

Chapter 4 I/O Ports
IV - 20 Port 2
Figure 4-4-4 Block Diagram (P27)
R
S
D
L
Q
Reset
Reset
Write
Port output data
Port input data
Data bus
Read
Read
Reset
P27
P2OUT7
P2IN7
Schmitt trigger input
Noise filter