Bits 7, 6, 4, and 3: Reserved bits
Bits 7, 6, 4, and 3 are reserved; they are always read as 1 and cannot be modified.
Bit 5: P22/SO1 pin PMOS control (POF1)
This bit controls the on/off state of the P22/SO1 pin output buffer PMOS.
Bit 5
POF1
Description
0
1
CMOS output
(initial value)
(initial value)
(initial value)
(initial value)
NMOS open-drain output
Bit 2: P22/SO1 pin function switch (SO1)
This bit selects whether pin P22/SO1 is used as P22 or as SO1.
Bit 2
SO1
Description
0
1
Functions as P22 I/O pin
Functions as SO1 output pin
Bit 1: P21/SI1 pin function switch (SI1)
This bit selects whether pin P21/SI1 is used as P21 or as SI1.
Bit 1
SI1
Description
0
Functions as P21 I/O pin
Functions as SI1 input pin
1
Bit 0: P20/SCK1 pin function switch (SCK1)
This bit selects whether pin P20/SCK1 is used as P20 or as SCK1.
Bit 0
SCK1
Description
0
1
Functions as P20 I/O pin
Functions as SCK1 I/O pin
142
ETC [ ETC ]
