HD6417751RBP240V Datasheet, PDF (866/1226 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

18. I/O Ports
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, 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 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
Description
RTSDT bit value is not output to the RTS2 pin
RTSDT bit value is output to the RTS2 pin
(Initial value)
Bit 6—Serial Port RTS Port Data (RTSDT): Specifies the serial port RTS2 pin input/output
data. Input or output is specified by the RTSIO pin (see the description of bit 7, RTSIO, for
details). When the RTS2 pin is designated as an output, the value of the RTSDT bit is output to the
RTS2 pin. The RTS2 pin value is read from the RTSDT bit regardless of the value of the RTSIO
bit. The initial value of this bit after a power-on reset or manual reset is undefined.
Bit 6: RTSDT
0
1
Description
Input/output data is low-level
Input/output data is high-level
Bit 5—Serial Port CTS Port I/O (CTSIO): Specifies serial port CTS2 pin input/output. When
the CTS2 pin is actually set as a port output pin and outputs the value set by the CTSDT bit, the
MCE bit in SCFCR2 should be cleared to 0.
Bit 5: CTSIO
0
1
Description
CTSDT bit value is not output to the CTS2 pin
CTSDT bit value is output to the CTS2 pin
(Initial value)
Rev.4.00 Oct. 10, 2008 Page 766 of 1122
REJ09B0370-0400