HD6417618 datasheet(400/646 Pages) RENESAS

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Section 14 Serial Communication Interface with FIFO (SCIF)

Rev. 6.00 Jun. 12, 2007 Page 368 of 610

REJ09B0131-0600

Transmitting Serial Data (Asynchronous Mode)

Figure 14.4 shows a sample flowchart for serial transmission.

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 in SCFTDR,

and read 1 from TDFE flag

and TEND flag in SCFSR,

then clear to 0

All data transmitted?

Read TEND flag in SCFSR

TEND = 1?

Break output?

Clear SPBDT to 0 and

set SPBIO to 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 read 1

from the TDFE and TEND flags, then

clear to 0.

The number of transmit data bytes

that can be written is 16 - (transmit

trigger set number).

[2] Serial transmission continuation

procedure:

To continue serial transmission, read

1 from the TDFE flag to confirm that

writing is possible, then write data to

SCFTDR, and then clear the TDFE

flag to 0.

[3] Break output at the end of serial

transmission:

To output a break in serial

transmission, clear the SPBDT bit to

0 and set the SPBIO bit to 1 in

SCSPTR, then clear the TE bit in

SCSCR to 0.

In [1] and [2], it is possible to

ascertain the number of data bytes

that can be written from the number

of transmit data bytes in SCFTDR

indicated by the upper 8 bits of

SCFDR.

[1]

[2]

[3]

Figure 14.4 Sample Flowchart for Transmitting Serial Data

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