HD643303x Hitachi, HD643303x Datasheet - Page 143

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

Port 2 Data Register (P2DR): P2DR is an 8-bit readable/writable register that stores data for pins
P2
When a bit in P2DDR is set to 1, if port 2 is read the value of the corresponding P2DR bit is
returned directly, regardless of the actual state of the pin. 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 Control Register (P2PCR): P2PCR is an 8-bit readable/writable register
that controls the MOS input pull-up transistors in port 2.
When a P2DDR bit is cleared to 0 (selecting generic input), if the corresponding bit from P2
to P2
P2PCR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.
7.3.3 Pin Functions in Each Mode
The pin functions of port 2 differ between mode 1 and modes 2 and 3. The pin functions in each
mode are described below.
Bit
Initial value
Read/Write
7
Bit
Initial value
Read/Write
to P2
0
PCR is set to 1, the input pull-up transistor is turned on.
0
.
P2 PCR
R/W
7
R/W
P2
7
0
7
0
7
P2 PCR
R/W
6
R/W
P2
6
0
6
0
6
P2 PCR
R/W
5
R/W
P2
Port 2 input pull-up control 7 to 0
These bits control input pull-up
transistors built into port 2
5
0
5
0
Port 2 data 7 to 0
These bits store data for port 2 pins
5
P2 PCR
128
R/W
4
R/W
P2
4
0
4
0
4
P2 PCR
R/W
3
R/W
P2
3
0
3
0
3
P2 PCR
R/W
2
R/W
P2
2
0
2
0
2
P2 PCR
R/W
1
R/W
P2
1
0
1
0
1
P2 PCR
R/W
0
R/W
P2
0
0
0
0
7
0
PCR