
CHAPTER 4 PORT FUNCTIONS
User’s Manual U17854EJ9V0UD
104
Figure 4-9. Block Diagram of P12 and P13
P12/SO00/TxD0,
P13/TxD3
WRPU
RD
WRPORT
WRPM
PU12, PU13
PM12, PM13
EVDD
P-ch
PU1
PM1
P1
Alternate
function
Output latch
(P12, P13)
Selector
Internal
bus
P1:
Port register 1
PU1:
Pull-up resistor option register 1
PM1:
Port mode register 1
RD:
Read signal
WR
××: Write signal