SH7125_08 Datasheet, PDF (448/774 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 12 Serial Communication Interface (SCI)
12.3.8 Serial Port Register (SCSPTR)
SCSPTR is an 8-bit register that controls input/output and data for the ports multiplexed with the
SCI function pins. Data to be output through the TXD pin can be specified to control break of
serial transfer. Through bits 3 and 2, data reading and writing through the SCK pin can be
specified. Bit 7 enables or disables RXI interrupts. The CPU can always read and write to
SCSPTR. When reading the value on the SCI pins, use the respective port register. For details, see
section 16, I/O Ports.
Bit: 7
6
5
4
3
2
1
0
EIO
-
-
-
SPB1IO SPB1DT
-
SPB0DT
Initial value: 0
0
0
0
0
0
0
1
R/W: R/W -
-
- R/W R/W -
W
Initial
Bit
Bit Name value
7
EIO
0
6 to 4 
All 0
3
SPB1IO 0
R/W Description
R/W Error Interrupt Only
Enables or disables RXI interrupts. While the EIO bit is
set to 1, the SCI does not request an RXI interrupt to
the CPU even if the RIE bit is set to 1.
0: The RIE bit enables or disables RXI and ERI
interrupts. While the RIE bit is 1, RXI and ERI
interrupts are sent to the INTC.
1: While the RIE bit is 1, only the ERI interrupt is sent to
the INTC.
 Reserved
These bits are always read as 0. The write value should
always be 0.
R/W Clock Port Input/Output in Serial Port
Specifies the input/output direction of the SCK pin in the
serial port. To output the data specified in the SPB1DT
bit through the SCK pin as a port output pin, set the C/A
bit in SCSMR and the CKE1 and CKE0 bits in SCSCR
to 0.
0: Does not output the SPB1DT bit value through the
SCK pin.
1: Outputs the SPB1DT bit value through the SCK pin.
Rev. 4.00 Jul. 25, 2008 Page 428 of 750
REJ09B0243-0400