HD64F38024HV Datasheet, PDF (227/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

Port Data Register 3 (PDR3)
Section 8 I/O Ports
Bit
Initial value
Read/Write
7
P3 ₇
0
R/W
6
P3₆
0
R/W
5
P3₅
0
R/W
4
P3₄
0
R/W
3
P3 ₃
0
R/W
2
P3₂
0
R/W
1
P3₁
0
R/W
0
P3₀
0
R/W
PDR3 is an 8-bit register that stores data for port 3 pins P3₇ to P3₀. If port 3 is read while PCR3
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
Initial value
Read/Write
7
PCR3 ₇
0
W
6
PCR3 ₆
0
W
5
PCR3 ₅
0
W
4
PCR3₄
0
W
3
PCR3 ₃
0
W
2
PCR3 ₂
0
W
1
PCR3₁
0
W
0
PCR3₀
0
W
PCR3 is an 8-bit register for controlling whether each of the port 3 pins P3₇ to P3₀ functions as an
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.
Rev. 8.00 Mar. 09, 2010 Page 205 of 658
REJ09B0042-0800