Renesas SH7641 User Manual

Page 786

Section 19 Serial Communication Interface with FIFO (SCIF)

Rev. 4.00 Sep. 14, 2005 Page 736 of 982

REJ09B0023-0400

• Transmitting Serial Data (Synchronous Mode)
Figure 19.13 shows a sample flowchart for transmitting serial data.

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

Start of transmission

Read TDFE flag in SCFSR

TDFE = 1?

Write transmit data to SCFTDR

and clear TDFE flag

in SCFSR to 0

All data transmitted?

Read TEND flag in SCFSR

TEND = 1?

Clear TE bit in SCSCR to 0

End of transmission

Yes

[1] SCIF status check and transmit data

write:

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.

[2] Serial transmission continuation

procedeure:

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
flag to 0.

[1]

[2]

Figure 19.13 Sample Flowchart for Transmitting Serial Data

This manual is related to the following products:

HD6417641