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Section 8 I/O Ports
1. Serial Port Control Register (SPCR)
Bit
7
—
Initial value
1
Read/Write
—
SPCR is an 8-bit readable/writable register that performs RXD
input/output data inversion switching. SPCR is initialized to H'C0 by a reset.
Bits 7 and 6: Reserved bits
Bits 7 and 6 are reserved; they are always read as 1 and cannot be modified.
Bit 5: P4
/TXD
pin function switch (SPC32)
2
32
This bit selects whether pin P4
Bit 5
SPC32
Description
0
Functions as P4
1
Functions as TXD
Note:
* Set the TE bit in SCR3 after setting this bit to 1.
Bit 4: P3
TXD
pin function switch (SPC31)
5/
31
This bit selects whether pin P3
Bit 4
SPC31
Description
0
Functions as P3
1
Functions as TXD
Note:
* Set the TE bit in SCR3 after setting this bit to 1.
Rev. 6.00 Aug 04, 2006 page 254 of 680
REJ09B0145-0600
6
5
4
—
SPC32
SPC31
1
0
0
—
R/W
R/W
/TXD
is used as P4
2
32
I/O pin
2
output pin*
32
/TXD
is used as P3
5
31
I/O pin
5
output pin*
31
3
2
SCINV3
SCINV2
0
0
R/W
R/W
, RXD
, TXD
31
32
or as TXD
.
2
32
or as TXD
.
5
31
1
0
SCINV1
SCINV0
0
0
R/W
R/W
, and TXD
pin
31
32
(initial value)
(initial value)
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