Renesas H8 Series Hardware Manual page 268

Section 8 I/O Ports
Port Data Register 8 (PDR8)
Bit 7
P8
Initial value 0
Read/Write R/W
PDR8 is an 8-bit register that stores data for port 8 pins P8
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.
Upon reset, PDR8 is initialized to H'00.
Port Control Register 8 (PCR8)
Bit 7
PCR8
Initial value 0
Read/Write W
PCR8 is an 8-bit register for controlling whether the port 8 pins P8
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.
Upon reset, PCR8 is initialized to H'00.
PCR8 is a write-only register, which is always read as all 1s.
Rev. 7.00 Mar 10, 2005 page 226 of 652
REJ09B0042-0700
6 5
P8 P8
7 6 5
0 0
R/W R/W
6 5
PCR8 PCR8
7 6
0 0
W W
4 3
P8 P8
4 3
0 0
R/W R/W
to P8
7 0
4 3
PCR8 PCR8
5 4 3
0 0
W W
2 1
P8 P8
2 1
0 0
R/W R/W
. If port 8 is read while PCR8
2 1
PCR8 PCR8
2 1
0 0
W W
to P8 functions as an input or
7 0
0
P8
0
0
R/W
0
PCR8
0
0
W