HD6417618 datasheet(412/646 Pages) RENESAS

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Section 14 Serial Communication Interface with FIFO (SCIF)

Rev. 6.00 Jun. 12, 2007 Page 380 of 610

REJ09B0131-0600

Receiving Serial Data (Synchronous Mode): Figure 14.15 shows a sample flowchart for

receiving serial data. When switching from asynchronous mode to synchronous mode without

SCIF initialization, make sure that ORER, PER, and FER are cleared to 0.

Start of reception

Read ORER flag in SCLSR

ORER = 1?

Read RDF flag in SCFSR

RDF = 1?

Read receive data in

SCFRDR, and clear RDF

flag in SCFSR to 0

All data received?

Clear RE bit in SCSCR to 0

End of reception

Yes

Error handling

[1] 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. Transmission/reception cannot be

resumed while the ORER flag is set to 1.

[2] 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.

[3] Serial reception continuation procedure:

To continue serial reception, read at least

the receive trigger set number of receive

data bytes from SCFRDR, read 1 from the

RDF flag, then clear the RDF flag to 0.

The number of receive data bytes in

SCFRDR can be ascertained by reading

SCFRDR.

[1]

[2]

[3]

Figure 14.15 Sample Flowchart for Receiving Serial Data (1)

Error handling

Clear ORER flag in SCLSR to 0

End

Overrun error handling

ORER = 1?

Yes

Figure 14.16 Sample Flowchart for Receiving Serial Data (2)

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