r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 1135

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

27.3.3
SCTSR is the register used to transmit serial data.
To perform serial data transmission, the SCIF first transfers transmit data from SCFTDR to
SCTSR, then sends the data to the SCIF_TXD pin starting with the LSB (bit 0).
When transmission of one byte is completed, the next transmit data is transferred from SCFTDR
to SCTSR, and transmission started, automatically.
SCTSR cannot be directly read from and written to by the CPU.
27.3.4
SCFTDR is an 8-bit FIFO register of 64 stages that stores data for serial transmission.
If SCTSR is empty when transmit data has been written to SCFTDR, the SCIF transfers the
transmit data written in SCFTDR to SCTSR and starts serial transmission.
SCFTDR is a write-only register, and cannot be read by the CPU.
The next data cannot be written when SCFTDR is filled with 64 bytes of transmit data. Data
written in this case is ignored.
Transmit Shift Register (SCTSR)
Transmit FIFO Data Register (SCFTDR)
Initial value:
Initial value:
R/W:
R/W:
BIt:
BIt:


—
W
7
7


—
W
6
6
Section 27 Serial Communication Interface with FIFO (SCIF)


—
W
5
5


—
W
4
4


—
W
3
3
Rev. 1.00 Oct. 01, 2007 Page 1069 of 1956


—
W
2
2


—
W
1
1


—
W
0
0
REJ09B0256-0100