hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 268

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 8 I/O Ports
Port Data Register 8 (PDR8)
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)
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
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
PCR8
R/W
P8
W
7
0
7
0
7
7
PCR8
R/W
P8
W
6
0
6
0
6
6
PCR8
R/W
P8
W
5
0
5
0
5
5
PCR8
R/W
P8
W
4
0
4
0
4
4
PCR8
7
R/W
P8
to P8
W
3
0
3
0
3
3
0
. If port 8 is read while PCR8
7
PCR8
to P8
R/W
P8
W
2
0
2
0
2
0
2
functions as an input or
PCR8
R/W
P8
W
1
0
1
0
1
1
PCR8
R/W
P8
W
0
0
0
0
0
0