SH7750_08 Datasheet, PDF (903/1162 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

18.2.6 Serial Port Register (SCSPTR1)
Bit: 7
6
5
EIO
—
—
Initial value: 0
0
0
R/W: R/W
—
—
Section 18 I/O Ports
4
3
2
1
0
— SPB1IO SPB1DT SPB0IO SPB0DT
0
0
—
0
—
—
R/W R/W R/W R/W
The serial port register (SCSPTR1) is an 8-bit readable/writable register that controls input/output
and data for the port pins multiplexed with the serial communication interface (SCI) pins. Input
data can be read from the RxD pin, output data written to the TxD pin, and breaks in serial
transmission/reception controlled, by means of bits 1 and 0. SCK pin data reading and output data
writing can be performed by means of bits 3 and 2. Bit 7 controls enabling and disabling of the
RXI interrupt.
SCSPTR1 can be read or written to by the CPU at all times. All SCSPTR1 bits except bits 2 and 0
are initialized to H'00 by a power-on reset or manual reset; the value of bits 2 and 0 is undefined.
SCSPTR1 is not initialized in the module standby state or standby mode.
Bit 7—Error Interrupt Only (EIO): See section 15.2.8, Serial Port Register (SCSPTR1).
Bits 6 to 4—Reserved: These bits are always read as 0, and should only be written with 0.
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/A bit in SCSMR1 and the CKE1 and CKE0 bits in SCSCR1 should be cleared to 0.
Bit 3: SPB1IO
0
1
Description
SPB1DT bit value is not output to the SCK pin
SPB1DT bit value is output to the SCK pin
(Initial value)
Rev.7.00 Oct. 10, 2008 Page 819 of 1074
REJ09B0366-0700