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Section 8 I/O Ports
1. Port Data Register 8 (PDR8)
Bit
7
P8
Initial value
0
Read/Write
R/W
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.
2. Port Control Register 8 (PCR8)
Bit
7
PCR8
Initial value
0
Read/Write
W
PCR8 is an 8-bit register for controlling whether each of the port 8 pins P8
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. 6.00 Aug 04, 2006 page 242 of 680
REJ09B0145-0600
6
5
P8
P8
7
6
5
0
0
R/W
R/W
6
5
PCR8
PCR8
7
6
5
0
0
W
W
4
3
P8
P8
P8
4
3
0
0
R/W
R/W
R/W
to P8
. If port 8 is read while PCR8
7
0
4
3
PCR8
PCR8
PCR8
4
3
0
0
W
W
2
1
0
P8
P8
2
1
0
0
0
R/W
R/W
2
1
0
PCR8
PCR8
2
1
0
0
0
W
W
W
to P8
functions as an
7
0
0
0
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