HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 193

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

Port Mode Register 7 (PMR7)
PMR7 is an 8-bit read/write register that turns the PMOS transistors of pins and P3
off.
Upon reset, PMR7 is initialized to H'F8.
Bits 7 to 3—Reserved Bits: Bits 7 to 3 are reserved; they are always read as 1, and cannot be
modified.
Bit 2—P2
or as TXD.
Bit 2: TXD
0
1
Bit 1—Reserved Bit: Bit 1 is reserved: it is always read as 0 and cannot be modified.
Bit 0—P3
pin output buffer.
Bit 0: POF1
0
1
Bit
Initial value
Read/Write
2
2
/TXD Pin Function Switch (TXD): Bit 2 selects whether pin P2
/SO
1
pin PMOS control (POF1): This bit controls the PMOS transistor in the P3
Description
Functions as P2
Functions as TXD output pin
Description
CMOS output
NMOS open-drain output
—
—
7
0
—
—
6
0
2
I/O pin
—
—
5
0
—
—
4
0
—
—
3
0
TXD
R/W
2
0
2
/TXD is used as P2
—
—
1
0
2
/SO
(initial value)
(initial value)
1
on and
POF1
R/W
2
0
0
/SO
185
2
1