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Bit 3—Serial Port Clock Port I/O (SPB1IO): Specifies serial port SCK pin input/output. When
the SCK pin is actually set as a port output pin and outputs the value set by the SPB1DT bit, the
C/$ bit in SCSMR1 and the CKE1 and CKE0 bits in SCSCR1 should be cleared to 0.
Bit 3: SPB1IO
0
1
Bit 2—Serial Port Clock Port Data (SPB1DT): Specifies the serial port SCK pin input/output
data. Input or output is specified by the SPB1IO bit (see the description of bit 3, SPB1IO, for
details). When output is specified, the value of the SPB1DT bit is output to the SCK pin. The SCK
pin value is read from the SPB1DT bit regardless of the value of the SPB1IO bit. The initial value
of this bit after a power-on reset or manual reset is undefined.
Bit 2: SPB1DT
0
1
Bit 1—Serial Port Break I/O (SPB0IO): Specifies the serial port TxD pin output condition.
When the TxD pin is actually set as a port output pin and outputs the value set by the SPB0DT bit,
the TE bit in SCSCR1 should be cleared to 0.
Bit 1: SPB0IO
0
1
Bit 0—Serial Port Break Data (SPB0DT): Specifies the serial port RxD pin input data and TxD
pin output data. The TxD pin output condition is specified by the SPB0IO bit (see the description
of bit 1, SPB0IO, for details). When the TxD pin is designated as an output, the value of the
SPB0DT bit is output to the TxD pin. The RxD pin value is read from the SPB0DT bit regardless
of the value of the SPB0IO bit. The initial value of this bit after a power-on reset or manual reset
is undefined.
Bit 0: SPB0DT
0
1
Description
SPB1DT bit value is not output to the SCK pin
SPB1DT bit value is output to the SCK pin
Description
Input/output data is low-level
Input/output data is high-level
Description
SPB0DT bit value is not output to the TxD pin
SPB0DT bit value is output to the TxD pin
Description
Input/output data is low-level
Input/output data is high-level
(Initial value)
(Initial value)
Rev. 4.0, 04/00, page 655 of 850
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