HD6433937 Datasheet, PDF (171/521 Pages) Hitachi Semiconductor – Hardware Manual

1. Port data register 5 (PDR5)
Bit
Initial value
Read/Write
7
P5 ₇
0
R/W
6
P5 ₆
0
R/W
5
P5₅
0
R/W
4
P5 ₄
0
R/W
3
P5₃
0
R/W
2
P5₂
0
R/W
1
P5₁
0
R/W
0
P5 ₀
0
R/W
PDR5 is an 8-bit register that stores data for port 5 pins P5₇ to P5₀. If port 5 is read while PCR5
bits are set to 1, the values stored in PDR5 are read, regardless of the actual pin states. If port 5 is
read while PCR5 bits are cleared to 0, the pin states are read.
Upon reset, PDR5 is initialized to H'00.
2. Port control register 5 (PCR5)
Bit
Initial value
Read/Write
7
PCR5₇
0
W
6
PCR5₆
0
W
5
PCR5₅
0
W
4
PCR5₄
0
W
3
PCR5₃
0
W
2
PCR5₂
0
W
1
PCR5₁
0
W
0
PCR5₀
0
W
PCR5 is an 8-bit register for controlling whether each of the port 5 pins P5₇ to P5₀ functions as an
input pin or output pin. Setting a PCR5 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin. PCR5 and PDR5 settings are valid when the
corresponding pins are designated for general-purpose input/output by PMR5.
Upon reset, PCR5 is initialized to H'00.
PCR5 is a write-only register, which is always read as all 1s.
3. Port pull-up control register 5 (PUCR5)
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
PUCR5₇ PUCR5₆ PUCR5₅ PUCR5₄ PUCR5₃ PUCR5₂ PUCR5₁ PUCR5₀
0
0
0
0
0
0
0
0
R/W
R/W R/W
R/W R/W R/W
R/W R/W
PUCR5 controls whether the MOS pull-up of each of port 5 pins P5₇ to P5₀ is on or off. When a
PCR5 bit is cleared to 0, setting the corresponding PUCR5 bit to 1 turns on the MOS pull-up for
the corresponding pin, while clearing the bit to 0 turns off the MOS pull-up.
Upon reset, PUCR5 is initialized to H'00.
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