Section 8 I/O Ports
Rev. 7.00 Mar 10, 2005 page 226 of 652
REJ09B0042-0700
Port Data Register 8 (PDR8)
Bit
Initial value
Read/Write
7
P8
7
0
R/W
6
P8
6
0
R/W
5
P8
5
0
R/W
4
P8
4
0
R/W
3
P8
3
0
R/W
0
P8
0
R/W
2
P8
2
0
R/W
1
P8
1
0
R/W
0
PDR8 is an 8-bit register that stores data for port 8 pins P8
7
to P8
0
. 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
PCR8
7
0
W
6
PCR8
6
0
W
5
PCR8
5
0
W
4
PCR8
4
0
W
3
PCR8
3
0
W
0
PCR8
0
0
W
2
PCR8
2
0
W
1
PCR8
1
0
W
PCR8 is an 8-bit register for controlling whether the port 8 pins P8
7
to P8
0
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.
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