HD6433802H Datasheet, PDF (174/435 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

1. Port data register 8 (PDR8)
Bit
7
6
5
4
3
2
1
0
—
—
—
—
—
—
—
P8 ₀
Initial value
—
—
—
—
—
—
—
0
Read/Write
—
—
—
—
—
—
—
R/W
PDR8 is an 8-bit register that stores data for port 8 pin P8₀. If port 8 is read while PCR8 bits are
set to 1, the values stored in PDR8 are read, regardless of the actual pin states. If port 8 is read
while PCR8 bits are cleared to 0, the pin states are read.
2. Port control register 8 (PCR8)
Bit
7
6
5
4
3
2
1
0
—
—
—
—
—
—
— PCR8
Initial value
—
—
—
—
—
—
—
0
Read/Write
W
W
W
W
W
W
W
W
PCR8 is an 8-bit register for controlling whether the port 8 pin P8₀ functions as an input or output
pin. Setting a PCR8 bit to 1 makes the corresponding pin an output pin, while clearing the bit to 0
makes the pin an input pin. PCR8 and PDR8 settings are valid when the corresponding pins are
designated for general-purpose input/output by bits SGS3 to SGS0 in LPCR.
PCR8 is a write-only register, which is always read as all 1s.
Bits 7 to 1: Reserved bits
Bits 7 to 1 are reserved; only 0 can be written to these bits.
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