HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 192

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

Port Mode Register 3 (PMR3)
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 are always read as 0 and cannot be
modified.
Bit 2—P3
or as SO
Bit 2: SO1
0
1
Bit 1—P3
as SI
Bit 1: SI1
0
1
Bit 0—P3
P3
Bit 0: SCK1
0
1
184
Bit
Initial value
Read/Write
0
or as SCK
1
.
1
.
2
1
0
/SO
/SI
/SCK
1
1
1
.
Pin Function Switch (SI1): This bit selects whether pin P3
Pin Function Switch (SO1): This bit selects whether pin P3
1
Pin Function Switch (SCK1): This bit selects whether pin P3
Description
Functions as P3
Functions as SO
Description
Functions as P3
Functions as SI
Description
Functions as P3
Functions as SCK
—
—
7
0
—
—
6
0
1
2
1
0
1
input pin
I/O pin
I/O pin
I/O pin
1
output pin
I/O pin
—
—
5
0
—
—
4
0
—
—
3
0
SO1
R/W
2
0
1
/SI
2
/SO
1
is used as P3
0
R/W
/SCK
SI1
1
1
0
is used as P3
(initial value)
(initial value)
(initial value)
1
is used as
SCK1
R/W
0
0
1
or
2