HD64F38024HV Datasheet, PDF (250/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

Section 8 I/O Ports
Port Data Register 8 (PDR8)
Bit
Initial value
Read/Write
7
P8₇
0
R/W
6
P8₆
0
R/W
5
P8₅
0
R/W
4
P8₄
0
R/W
3
P8₃
0
R/W
2
P8₂
0
R/W
1
P8₁
0
R/W
0
P8 ₀
0
R/W
PDR8 is an 8-bit register that stores data for port 8 pins P8₇ to 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.
Upon reset, PDR8 is initialized to H'00.
Port Control Register 8 (PCR8)
Bit
Initial value
Read/Write
7
PCR8₇
0
W
6
PCR8₆
0
W
5
PCR8₅
0
W
4
PCR8₄
0
W
3
PCR8₃
0
W
2
PCR8₂
0
W
1
PCR8₁
0
W
0
PCR8₀
0
W
PCR8 is an 8-bit register for controlling whether the port 8 pins P8₇ to 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.
Upon reset, PCR8 is initialized to H'00.
PCR8 is a write-only register, which is always read as all 1s.
Rev. 8.00 Mar. 09, 2010 Page 228 of 658
REJ09B0042-0800