r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 1173

Manufacturer Part Number

r5s77631ay266bgv

Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series

Manufacturer

Renesas Electronics Corporation.

Figure 27.17 shows a sample flowchart for serial transmission.

Use the following procedure for serial data transmission after enabling the SCIF for transmission.

In serial transmission, the SCIF operates as described below.

1. When data is written into SCFTDR, the SCIF transfers the data from SCFTDR to SCTSR and

2. When data is transferred from SCFTDR to SCTSR and transmission is started, consecutive

starts transmitting. Confirm that the TDFE flag in SCFSR is set to 1 before writing transmit

data to SCFTDR. The number of data bytes that can be written is at least 64 (transmit trigger

transmit operations are performed until there is no transmit data left in SCFTDR. When the

number of transmit data bytes in SCFTDR falls to or below the transmit trigger number set in

Serial Data Transmission (Clocked Synchronous Mode)

Write transmit data to SCFTDR

Clear TE bit in SCSCR to 0

Read TEND flag in SCFSR

Read TDFE flag in SCFSR

TEND flag in SCFSR to 0

and clear TDFE flag and

Start of transmission

All data transmitted?

End of transmission

Figure 27.17 Sample Serial Transmission Flowchart

Initialization

Section 27 Serial Communication Interface with FIFO (SCIF)

[1] SCIF initialization:

[2] SCIF status check and transmit data

[3] Serial transmission continuation

See sample SCIF initialization

flowchart in figure 27.16.

Read SCFSR and check that the

TDFE flag is set to 1, then write

transmit data to SCFTDR, and clear

the TDFE flag to 0. The transition of

the TDFE flag from 0 to 1 can also be

identified by a TXI interrupt.

To continue serial transmission, read

1 from the TDFE flag to confirm that

writing is possible, them write data to

SCFTDR, and then clear the TDFE

Rev. 1.00 Oct. 01, 2007 Page 1107 of 1956

REJ09B0256-0100