Serial Port Register (Scsptr2) - Hitachi SH7751 Hardware Manual

18.2.7

Serial Port Register (SCSPTR2)

Bit: 15
—
Initial value: 0
R/W: R
Bit: 7
RTSIO
Initial value: 0
R/W: 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 with FIFO (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. SCK2 pin data reading and
output data writing can be performed by means of bits 3 and 2.
data writing can be performed by means of bits 5 and 4, and
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, 2,
and 0 are initialized to 0 by a power-on reset or manual reset; the value of bits 6, 4, 2, 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

the 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
14 13
— —
0 0
R R
6 5
RTSDT CTSIO
— 0
R/W R/W
Description
RTSDT bit value is not output to the
RTSDT bit value is output to the
12 11
— —
0 0
R R
4 3
CTSDT SCKIO SCKDT
— 0
R/W R/W



pin data reading and output


pin

pin
Rev. 3.0, 04/02, page 725 of 1064
10 9
— —
0 0
R R
2 1
SPB2IO SPB2DT
— 0
R/W R/W
pin data reading and output
pin input/output. When
(Initial value)
8
—
0
R
0
—
R/W