Table of Contents
Advertisement
In modes 5 to 7, P2DDR is a write-only register. Its value cannot be read. All bits return 1 when
read.
www.DataSheet4U.com
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
to P2
. When a bit in P2DDR is set to 1, if port 2 is read the value of the
7
0
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.
Bit
Initial value
Read/Write
R/W
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
7
P2 PCR
7
Initial value
0
Read/Write
R/W
In modes 5 to 7, when a P2DDR bit is cleared to 0 (selecting generic input), if the corresponding
bit from P2
PCR to P2
7
P2PCR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting.
7
6
5
P2
P2
P2
7
6
5
0
0
0
R/W
R/W
Port 2 data 7 to 0
These bits store data for port 2 pins
6
5
P2 PCR
P2 PCR
6
5
0
0
R/W
R/W
Port 2 input pull-up MOS control 7 to 0
These bits control input pull-up
transistors built into port 2
PCR is set to 1, the input pull-up MOS is turned on.
0
4
3
P2
P2
P2
4
3
0
0
R/W
R/W
R/W
4
3
2
P2 PCR
P2 PCR
P2 PCR
4
3
2
0
0
0
R/W
R/W
R/W
251
2
1
0
P2
P2
2
1
0
0
0
0
R/W
R/W
1
0
P2 PCR
P2 PCR
1
0
0
0
R/W
R/W
Advertisement
Table of Contents
