HD6433802H Datasheet, PDF (171/435 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

1. Port data register 7 (PDR7)
Bit
Initial value
Read/Write
7
P7 ₇
0
R/W
6
P7 ₆
0
R/W
5
P7₅
0
R/W
4
P7 ₄
0
R/W
3
P7₃
0
R/W
2
P7 ₂
0
R/W
1
P7₁
0
R/W
0
P7₀
0
R/W
PDR7 is an 8-bit register that stores data for port 7 pins P7₇ to P7₀. If port 7 is read while PCR7
bits are set to 1, the values stored in PDR7 are read, regardless of the actual pin states. If port 7 is
read while PCR7 bits are cleared to 0, the pin states are read.
Upon reset, PDR7 is initialized to H'00.
2. Port control register 7 (PCR7)
Bit
Initial value
Read/Write
7
PCR7₇
0
W
6
PCR7₆
0
W
5
PCR7₅
0
W
4
PCR7₄
0
W
3
PCR7₃
0
W
2
PCR7₂
0
W
1
PCR7₁
0
W
0
PCR7₀
0
W
PCR7 is an 8-bit register for controlling whether each of the port 7 pins P7₇ to P7₀ functions as an
input pin or output pin. Setting a PCR7 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin. PCR7 and PDR7 settings are valid when the
corresponding pins are designated for general-purpose input/output by bits SGS3 to SGS0 in
LPCR.
Upon reset, PCR7 is initialized to H'00.
PCR7 is a write-only register, which is always read as all 1s.
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