Port 1 Data Register (P1DR)
Bit
7
P17
0
6
P16
0
5
P15
0
4
P14
0
3
P13
0
2
P12
0
1
P11
0
0
P10
0
Initial value
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P1DR is an 8-bit register that stores data for pins P17 to P10. When a P1DDR bit is set to 1, if port
1 is read, the value in P1DR is obtained directly, regardless of the actual pin state. When a P1DDR
bit is cleared to 0, if port 1 is read the pin state is obtained.
P1DR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
Port 1 Input Pull-Up Control Register (P1PCR)
Bit
7
6
5
4
3
2
1
0
P17PCR P16PCR P15PCR P14PCR P13PCR P12PCR P11PCR P10PCR
Initial value
Read/Write
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P1PCR is an 8-bit readable/writable register that controls the input pull-up transistors in port 1. If
a P1DDR bit is cleared to 0 (designating input) and the corresponding P1PCR bit is set to 1, the
input pull-up transistor is turned on.
P1PCR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
106
HITACHI [ HITACHI SEMICONDUCTOR ]
