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Port 1 Data Register (P1DR): P1DR is an 8-bit readable/writable register that stores data for pins
P1
7
Bit
Initial value
Read/Write
When a bit in P1DDR is set to 1, if port 1 is read the value of the corresponding P1DR bit is
returned directly, regardless of the actual state of the pin. When a bit in P1DDR is cleared to 0, if
port 1 is read the corresponding pin level is read.
P1DR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its previous setting.
7.2.3 Pin Functions in Each Mode
The pin functions of port 1 differ between mode 1 and modes 2 and 3 (single-chip modes). The pin
functions in each mode are described below.
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to P1
.
0
7
6
P1
P1
7
6
0
0
R/W
R/W
5
4
3
P1
P1
P1
P1
5
4
3
0
0
0
R/W
R/W
R/W
R/W
Port 1 data 7 to 0
These bits store data for port 1 pins
124
2
1
0
P1
P1
2
1
0
0
0
0
R/W
R/W
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