r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 563

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

14.3.1
SCRSR receives serial data. Data input at the RXD pin is loaded into SCRSR in the order
received, LSB (bit 0) first, converting the data to parallel form. When one byte has been received,
it is automatically transferred to SCRDR. The CPU cannot read or write to SCRSR directly.
14.3.2
SCRDR is a register that stores serial receive data. After receiving one byte of serial data, the SCI
transfers the received data from the receive shift register (SCRSR) into SCRDR for storage and
completes operation. After that, SCRSR is ready to receive data.
Since SCRSR and SCRDR work as a double buffer in this way, data can be received continuously.
SCRDR is a read-only register and cannot be written to by the CPU.
14.3.3
SCTSR transmits serial data. The SCI loads transmit data from the transmit data register (SCTDR)
into SCTSR, then transmits the data serially from the TXD pin, LSB (bit 0) first. After
transmitting one data byte, the SCI automatically loads the next transmit data from SCTDR into
SCTSR and starts transmitting again. If the TDRE flag in the serial status register (SCSSR) is set
to 1, the SCI does not transfer data from SCTDR to SCTSR. The CPU cannot read or write to
SCTSR directly.
Receive Shift Register (SCRSR)
Receive Data Register (SCRDR)
Transmit Shift Register (SCTSR)
Initial value:
Initial value:
Initial value:
R/W:
R/W:
R/W:
Bit:
Bit:
Bit:
7
7
7
-
-
-
-
-
-
6
6
6
-
-
-
-
-
-
5
5
5
-
-
-
-
-
-
4
4
4
-
-
-
-
-
-
Section 14 Serial Communication Interface (SCI)
3
3
3
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-
-
-
-
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Rev. 1.00 Sep. 21, 2007 Page 537 of 1124
2
2
2
-
-
-
-
-
-
1
1
1
-
-
-
-
-
-
0
0
0
-
-
-
-
-
-
REJ09B0402-0100