HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 264

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

In modes 5 to 7, P2DDR is a write-only register. Its value cannot be read. All bits return 1 when
read.
P2DDR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting. If a P2DDR bit is set to 1, the corresponding pin maintains its output
state in software standby mode.
Port 2 Data Register (P2DR): P2DR is an 8-bit readable/writable register that stores output data
for pins P2
corresponding P2DR bit is returned. When a bit in P2DDR is cleared to 0, if port 2 is read the
corresponding pin level is read.
P2DR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.
Port 2 Input Pull-Up MOS Control Register (P2PCR): P2PCR is an 8-bit readable/writable
register that controls the MOS input pull-up transistors in port 2.
Bit
Initial value
Read/Write
In modes 5 to 7, when a P2DDR bit is cleared to 0 (selecting generic input), if the corresponding
bit from P2
P2PCR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting.
Bit
Initial value
Read/Write
7
7
PCR to P2
to P2
P2 PCR
R/W
0
7
. When a bit in P2DDR is set to 1, if port 2 is read the value of the
7
0
R/W
P2
7
0
7
0
PCR is set to 1, the input pull-up MOS is turned on.
P2 PCR
R/W
6
6
0
R/W
P2
6
0
6
P2 PCR
R/W
5
Port 2 input pull-up MOS control 7 to 0
These bits control input pull-up
transistors built into port 2
5
0
R/W
P2
5
0
Port 2 data 7 to 0
These bits store data for port 2 pins
5
P2 PCR
251
R/W
4
4
0
R/W
P2
4
0
4
P2 PCR
R/W
3
3
0
R/W
P2
3
0
3
P2 PCR
R/W
2
2
0
R/W
P2
2
0
2
P2 PCR
R/W
1
1
0
R/W
P2
1
0
1
P2 PCR
R/W
0
0
0
R/W
P2
0
0
0