NEC PD78F9488 User Manual
Page 81
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15331EJ4V1UD
81
Figure 4-6. Block Diagram of P22 and P25
P22/SI20/
RxD20,
P25/SI10
WR
PUB2
RD
WR
PORT
WR
PM
PUB22, PUB25
Alternate
function
Output latch
(P22, P25)
PM22, PM25
V
DD
P-ch
Internal bus
Selector
PUB2: Pull-up resistor option register B2
PM:
Port mode register
RD:
Port 2 read signal
WR:
Port 2 write signal