NEC switch - Manual (Page 67)

CHAPTER 4 PORT FUNCTIONS
User’s Manual U12978EJ3V0UD
67
Figure 4-9. Block Diagram of P26
RD
V DD0
P26
WR
POM1
WR PU0
WR
PORT
WR PM
Output latch
(P26)
PM26
PU02
P-ch
P-ch
N-ch
V
DD0
POM126
Internal bus
Selector
POM1: Port output mode register 1
PU0: Pull-up resistor option register 0
PM: Port mode register
RD: Port 2 read signal
WR: Port 2 write signal