CHAPTER 5 PORT FUNCTIONS
User’s Manual U15109EJ3V0UD
151
(3) Block diagram (port 2)
Figure 5-5. Block Diagram of P20 and P22
WR
PM
WR
PF
WR
PORT
RD
V
DD
Selector
PF2n
PF2
PM2n
PM2
P-ch
N-ch
Internal bus
Output latch
(P2n)
Alternate function
P20/SI2/SDA1
P22/SCK2/SCL1
Remarks 1.
PF2:
Port 2 function register
PM2: Port 2 mode register
RD:
Port 2 read signal
WR:
Port 2 write signal
2.
n = 0, 2