CHAPTER 14 PORT FUNCTIONS
User’s Manual U14359EJ4V0UM
480
(c) Port 4 function control register (PFC4)
This register can be read/written in 8-bit or 1-bit units. Bits 7 to 5 and 2, however, are fixed to 0, so
writing 1 to these bits is ignored.
Caution
When the port mode is specified by the port 4 mode control register (PMC4), the PFC4
register setting becomes invalid.
7
6
5
4
3
2
1
0
Address
After reset
PFC4
0
0
0
PFC44
PFC43
0
PFC41
PFC40
FFFFF468H
00H
Bit position
Bit name
Function
4
PFC44
Port Function Control
Specifies operation mode of P44 pin in control mode.
0: SI1 input mode
1: RXD1 input mode
3
PFC43
Port Function Control
Specifies operation mode of P43 pin in control mode.
0: SO1 output mode
1: TXD1 output mode
1
PFC41
Port Function Control
Specifies operation mode of P41 pin in control mode.
0: SI0 input mode
1: RXD0 input mode
0
PFC40
Port Function Control
Specifies operation mode of P40 pin in control mode.
0: SO0 output mode
1: TXD0 output mode