Serial Port Register (Scsptr2) - Hitachi SH7750 Hardware Manual

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. CTS2 pin data reading and output data
writing can be performed by means of bits 5 and 4, and RTS2 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 RTS2 pin input/output. When
the RTS2 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. 6.0, 07/02, page 748 of 986
15 14
— —
0 0
R R
7 6
RTSIO RTSDT CTSIO
0 —
R/W R/W
Description
RTSDT bit value is not output to the RTS2 pin
RTSDT bit value is output to the RTS2 pin
13 12 11
— — —
0 0
R R
5 4
CTSDT —
0 —
R/W R/W
10 9
— —
0 0 0
R R R
3 2 1
— SPB2IO SPB2DT
0 0 0
R R R/W
8
—
0
R
0
—
R/W
(Initial value)