Renesas H8 Series Hardware Manual page 245

Port Data Register 3 (PDR3)
Bit 7
P3
Initial value 0
Read/Write R/W
PDR3 is an 8-bit register that stores data for port 3 pins P3
bits are set to 1, the values stored in PDR3 are read, regardless of the actual pin states. If port 3 is
read while PCR3 bits are cleared to 0, the pin states are read.
Upon reset, PDR3 is initialized to H'00.
Port Control Register 3 (PCR3)
Bit 7
PCR3
Initial value 0
Read/Write W
PCR3 is an 8-bit register for controlling whether each of the port 3 pins P3
input pin or output pin. Setting a PCR3 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 PCR3 and in PDR3 are valid only
when the corresponding pin is designated in PMR3 as a general I/O pin.
Upon reset, PCR3 is initialized to H'00.
PCR3 is a write-only register, which is always read as all 1s.
6 5
P3 P3
7 6 5
0 0
R/W R/W
6 5
PCR3 PCR3
7 6
0 0
W W
4 3
P3 P3
4 3
0 0
R/W R/W
to P3
7 0
4 3
PCR3 PCR3
5 4 3
0 0
W W
Rev. 7.00 Mar 10, 2005 page 203 of 652
Section 8 I/O Ports
2 1
P3 P3
2 1
0 0
R/W R/W
. If port 3 is read while PCR3
2 1
PCR3 PCR3
2 1
0 0
W W
to P3 functions as an
7 0
REJ09B0042-0700
0
P3
0
0
R/W
0
PCR3
0
0
W