HD6433935 Hitachi, HD6433935 Datasheet - Page 290

• Manufacturer Part Number: HD6433935
• Description: 8-Bit MICROCONTROLLER
• Manufacturer: Hitachi

10. Serial Port Control Register (SPCR)
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
This bit selects whether pin P4
Bit 5
SPC32
0
1
Note:
Bit 4: P3
This bit selects whether pin P3
Bit 4
SPC31
0
1
Note:
Bit 3: TXD
Bit 3 specifies whether or not TXD
Bit 3
SCINV3
0
1
278
Bit
Initial value
Read/Write
*
*
2
5
/TXD
/TXD
Set the TE bit in SCR3 after setting this bit to 1.
Set the TE bit in SCR3 after setting this bit to 1.
32
pin output data inversion switch
Description
Functions as P4
Functions as TXD
Description
Functions as P3
Functions as TXD
Description
TXD
TXD
32
31
pin function switch (SPC32)
pin function switch (SPC31)
32
32
—
—
7
1
output data is not inverted
output data is inverted
—
—
2
5
2
5
6
1
/TXD
/TXD
I/O pin
I/O pin
32
31
output pin*
output pin*
32
SPC32
32
31
pin output data is to be inverted.
R/W
is used as P4
is used as P3
5
0
SPC31
R/W
4
0
2
5
or as TXD
or as TXD
SCINV3
R/W
3
0
31
, RXD
32
31
.
.
SCINV2
R/W
2
0
32
, TXD
SCINV1
31
R/W
, and TXD
1
0
(initial value)
(initial value)
(initial value)
SCINV0
R/W
0
0
32
pin