HD64F3437TF16 Datasheet, PDF (135/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

Port 1 Data Register (P1DR)
Bit
7
P1₇
Initial value
0
Read/Write R/W
6
P1₆
0
R/W
5
P1₅
0
R/W
4
P1₄
0
R/W
3
P1₃
0
R/W
2
P1₂
0
R/W
1
P1₁
0
R/W
0
P1₀
0
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
Initial value
Read/Write
7
6
5
4
3
2
1
0
P1₇PCR P1₆PCR P1₅PCR P1₄PCR P1₃PCR P1₂PCR P1₁PCR P1₀PCR
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.
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