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8.12.2
Register Configuration and Descriptions
Table 8.31 shows the registers used by the input/output data inversion function.
Table 8.31 Register Configuration
Name
Serial port control register
Serial Port Control Register (SPCR)
Bit
Initial value
Read/Write
SPCR is an 8-bit readable/writable register that performs RXD
inversion switching.
Bits 7 and 6—Reserved
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—Reserved
Bit 4 is reserved; it can only be written with 0.
Rev. 6.00, 08/04, page 234 of 628
Abbr.
SPCR
7
6
5
SPC32
1
1
0
R/W
/TXD
is used as P4
2
32
I/O pin
2
output pin *
32
R/W
Address
R/W
H'FF91
4
3
2
SCINV3
SCINV2
0
0
W
R/W
R/W
and TXD
32
or as TXD
.
2
32
1
0
W
W
pin input/output data
32
(initial value)
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