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18.2.7
Serial Port Register (SCSPTR2)
Bit:
Initial value:
R/W:
Bit:
Initial value:
R/W:
The serial port register (SCSPTR2) is a 16-bit readable/writable register that controls input/output
and data for the port pins multiplexed with the serial communication interface (SCIF) pins. Input
data can be read from the RxD2 pin, output data written to the TxD2 pin, and breaks in serial
transmission/reception controlled, by means of bits 1 and 0. &765 pin data reading and output data
writing can be performed by means of bits 5 and 4, and 5765 pin data reading and output data
writing by means of bits 7 and 6.
SCSPTR2 can be read or written to by the CPU at all times. All SCSPTR2 bits except bits 6, 4,
and 0 are initialized to 0 by a power-on reset or manual reset; the value of bits 6, 4, and 0 is
undefined. SCSPTR2 is not initialized in standby mode or in the module standby state.
Bits 15 to 8—Reserved: These bits are always read as 0, and should only be written with 0.
Bit 7—Serial Port RTS Port I/O (RTSIO): Specifies serial port 5765 pin input/output. When
the 5765 pin is actually set as a port output pin and outputs the value set by the RTSDT bit, the
MCE bit in SCFCR2 should be cleared to 0.
Bit 7: RTSIO
0
1
Rev. 4.0, 04/00, page 656 of 850
15
14
—
—
0
0
R
R
7
6
RTSIO
RTSDT
0
—
R/W
R/W
Description
RTSDT bit value is not output to the 5765 pin
RTSDT bit value is output to the 5765 pin
13
12
—
—
0
0
R
R
5
4
CTSIO
CTSDT
0
—
R/W
R/W
11
10
—
—
0
0
R
R
3
2
—
—
SPB2IO SPB2DT
0
0
R
R
R/W
9
8
—
—
0
0
R
R
1
0
0
—
R/W
(Initial value)
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