CHAPTER 4 PORT FUNCTIONS
User’s Manual U15075EJ2V1UD
87
Figure 4-10. Block Diagram of P25
P25/SI20/
RxD20
WR
PUB2
RD
WR
PORT
WR
PM
PUB25
Alternate
function
Output latch
(P25)
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