SH7713 datasheet(615/904 Pages) RENESAS

615 / 904 page

Section 16 Serial Communication Interface with FIFO (SCIF)

Rev.1.50 Aug. 30, 2006 Page 575 of 860

REJ09B0288-0150

Serial Data Transmission: Figure 16.13 shows a sample flowchart for serial transmission. Use

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

Yes

Start transmission

Read TDFE bit in SCFSR

Write transmit data in SCFTDR and

clear TDFE and TEND bits in

SCFSR to 0

Yes

Read TEND bit in SCFSR

Clear TE bit in SCSCR to 0

TDFE = 1?

All data transmitted?

TEND = 1?

End transmission

Initialization

SCIF initialization: See figure 16.3, Sample

SCIF Initialization Flowchart.

SCIF status check and transmit data write:

Read SCFSR, check that the TDFE flag is

set to 1, then write transmit data in SCFTDR

and clear the TDFE flag to 0.

Serial transmission continuation procedure:

To continue serial transmission, read 1 from

the TDFE flag to confirm that writing is possible,

then write data in SCFTDR and clear the TDFE

flag to 0.

Figure 16.13 Sample Serial Transmission Flowchart

In serial transmission, the SCIF operates as described below.

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

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 16

− (transmit trigger

set number).

SH7713 Datasheet(PDF) 615 Page - Renesas Technology Corp