HD6433937 Datasheet, PDF (290/521 Pages) Hitachi Semiconductor – Hardware Manual

10. Serial Port Control Register (SPCR)
Bit
7
6
5
4
3
2
1
0
—
Initial value
1
Read/Write
—
— SPC32 SPC31 SCINV3 SCINV2 SCINV1 SCINV0
1
0
0
0
0
0
0
—
R/W
R/W
R/W
R/W
R/W
R/W
SPCR is an 8-bit readable/writable register that performs RXD₃₁, RXD₃₂, TXD₃₁, and TXD₃₂ pin
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: P4₂/TXD₃₂ pin function switch (SPC32)
This bit selects whether pin P4₂/TXD₃₂ is used as P4₂ or as TXD₃₂.
Bit 5
SPC32
Description
0
Functions as P4₂ I/O pin
1
Functions as TXD₃₂ output pin*
Note: * Set the TE bit in SCR3 after setting this bit to 1.
(initial value)
Bit 4: P3₅/TXD₃₁ pin function switch (SPC31)
This bit selects whether pin P3₅/TXD₃₁ is used as P3₅ or as TXD₃₁.
Bit 4
SPC31
Description
0
Functions as P3₅ I/O pin
1
Functions as TXD₃₁ output pin*
Note: * Set the TE bit in SCR3 after setting this bit to 1.
(initial value)
Bit 3: TXD₃₂ pin output data inversion switch
Bit 3 specifies whether or not TXD₃₂ pin output data is to be inverted.
Bit 3
SCINV3
0
1
Description
TXD₃₂ output data is not inverted
TXD₃₂ output data is inverted
(initial value)
278