HD6417618 datasheet(414/646 Pages) RENESAS

414 / 646 page

Section 14 Serial Communication Interface with FIFO (SCIF)

Rev. 6.00 Jun. 12, 2007 Page 382 of 610

REJ09B0131-0600

Transmitting and Receiving Serial Data Simultaneously (Synchronous Mode): Figure 14.18

shows a sample flowchart for transmitting and receiving serial data simultaneously.

Start of transmission and reception

Initialization

Read TDFE flag in SCFSR

TDFE = 1?

Write transmit data to SCFTDR

Read TDFE and TEND flags

in SCFSR while they are 1, then

clear them to 0

Read ORER flag in SCLSR

ORER = 1?

Read RDF flag in SCFSR

RDF = 1?

Clear TE and RE bits

in SCSCR to 0

End of transmission and reception

Read receive data in

SCFRDR, and clear RDF

flag in SCFSR to 0

All data received?

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. Read the

TDFE and TEND flags while they are

1, then clear them to 0. The transition

of the TDFE flag from 0 to 1 can also

be identified by a TXI interrupt.

[2] Receive error handling:

Read the ORER flag in SCLSR to

identify any error, perform the

appropriate error handling, then clear

the ORER flag to 0. Reception cannot

be resumed while the ORER flag is

set to 1.

[3] SCIF status check and receive data

read:

Read SCFSR and check that RDF =

1, then read the receive data in

SCFRDR, and clear the RDF flag to

0. The transition of the RDF flag from

0 to 1 can also be identified by an RXI

interrupt.

[4] Serial transmission and reception

continuation procedure:

To continue serial transmission and

reception, read 1 from the RDF flag

and the receive data in SCFRDR, and

clear the RDF flag to 0 before

receiving the MSB in the current

frame. Similarly, read 1 from the

TDFE flag to confirm that writing is

possible before transmitting the MSB

in the current frame. Then write data

to SCFTDR and clear the TDFE flag

to 0.

[1]

Yes

Error handling

[4]

When switching from a transmit operation

or receive operation to simultaneous

transmission and reception operations,

clear the TE and RE bits to 0, and then

set them simultaneously to 1.

Note:

[3]

[2]

Figure 14.18 Sample Flowchart for Transmitting/Receiving Serial Data

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