HD6473887 Datasheet, PDF (185/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

1. Port data register 9 (PDR9)
Bit
Initial value
Read/Write
7
P9₇
0
R/W
6
P9₆
0
R/W
5
P9₅
0
R/W
4
P9₄
0
R/W
3
P9₃
0
R/W
2
P9₂
0
R/W
1
P9₁
0
R/W
0
P9₀
0
R/W
PDR9 is an 8-bit register that stores data for port 9 pins P9₇ to P9₀. If port 9 is read while PCR9
bits are set to 1, the values stored in PDR9 are read, regardless of the actual pin states. If port 9 is
read while PCR9 bits are cleared to 0, the pin states are read.
Upon reset, PDR9 is initialized to H'00.
2. Port control register 9 (PCR9)
Bit
Initial value
Read/Write
7
PCR9₇
0
W
6
PCR9₆
0
W
5
PCR9₅
0
W
4
PCR9₄
0
W
3
PCR9₃
0
W
2
PCR9₂
0
W
1
PCR9₁
0
W
0
PCR9₀
0
W
PCR9 is an 8-bit register for controlling whether each of the port 9 pins P9₇ to P9₀ functions as an
input pin or output pin. Setting a PCR9 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin. The settings in PCR9 and PDR9 are valid only
when the corresponding pin is designated by bits SGS3 to SGS0 in LPCR as a general I/O pin.
Upon reset, PCR9 is initialized to H'00.
PCR9 is a write-only register, which is always read as all 1s.
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