HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 211

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

Port Data Register 9 (PDR9)
Notes: 1. Bits 7 to 6 are reserved; they are always read as 1 and cannot be modified.
PDR9 is an 8-bit register that stores data for port 9 pins P9
bits are set to 1, the values stored in PDR9 are read, regardless of the actual pin states. If port 9 is
read while PCR9 bits are cleared to 0, the pin states are read.
Upon reset, PDR9 is initialized to H'C0.
Port Control Register 9 (PCR9)
PCR9 controls whether each of the port 9 pins P9
Setting a PCR9 bit to 1 makes the corresponding pin an output pin, while clearing the bit to 0
makes the pin an input pin.
Upon reset, PCR9 is initialized to H'C0.
PCR9 is a write-only register, which is always reads as all 1.
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
2. Bit 5 is reserved; it is always read as 0 and cannot be modified.
3. In the on-chip flash memory version, this bit is always read as 0 and cannot be
modified.
1*
—
—
—
—
7
7
0
1
1*
—
—
—
—
6
6
0
1
0*
—
—
—
—
5
5
0
2
PCR9
4
R/W
to P9
P9
W
4
0
4
0
4
4
0
functions as an input pin or output pin.
4
PCR9
to P9
R/W
P9
W
3
0
3
0
3
0
3
. If port 9 is read while PCR9
PCR9
R/W
P9
W
2
0
2
0
2
2
PCR9
R/W
P9
W
0
1
1
0
1
1
PCR9
P9
R/W
W
0
0
0
0
0
*
203
3
0