Renesas F-ZTAT H8 Series Hardware Manual page 217

Upon reset, PUCR3 is initialized to H'00.
Port Mode Register 3 (PMR3)
Bit
Initial value
Read/Write
PMR3 is an 8-bit read/write register, controlling the selection of pin functions for port 3 pins.
Upon reset, PMR3 is initialized to H'00.
Bits 7 to 3—Reserved Bits: Bits 7 to 3 are reserved; they should always be cleared to 0.
Bit 2—P3 /SO Pin Function Switch (SO1): This bit selects whether pin P3
2 1
as SO .
1
Bit 2: SO1 Description
0 Functions as P3
1 Functions as SO
Bit 1—P3 /SI Pin Function Switch (SI1): This bit selects whether pin P3
1 1
SI .
1
Bit 1: SI1 Description
0 Functions as P3
1 Functions as SI
Bit 0—P3 /SCK Pin Function Switch (SCK1): This bit selects whether pin P3
0 1
P3 or as SCK .
0 1
Bit 0: SCK1 Description
0 Functions as P3
1 Functions as SCK
7 6 5
⎯ ⎯ ⎯
0 0 0
⎯ ⎯ ⎯
I/O pin
2
output pin
1
I/O pin
1
input pin
1
I/O pin
0
I/O pin
1
4 3 2
⎯ ⎯
SO1
0 0 0
⎯ ⎯
R/W
Rev.3.00 Jul. 19, 2007 page 191 of 532
8. I/O Ports
1 0
SI1 SCK1
0 0
R/W R/W
/SO is used as P3
2 1 2
(initial value)
/SI is used as P3 or as
1 1 1
(initial value)
/SCK is used as
0 1
(initial value)
REJ09B0397-0300
or