SH7713 datasheet(608/904 Pages) RENESAS

608 / 904 page

Section 16 Serial Communication Interface with FIFO (SCIF)

Rev.1.50 Aug. 30, 2006 Page 568 of 860

REJ09B0288-0150

Serial Data Reception: Figures 16.6 and 16.7 show a sample flowchart for serial reception.

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

Read ER, DR, and BRK flags in

SCFSR and ORER flag in SCLSR

Read RDF flag in SCFSR

Read receive data from

SCFRDR, and clear RDF flag

in SCFSR to 0

Clear RE bit in SCSCR to 0

1. Receive error handling and break detection:

Read the DR, ER, and BRK flags in SCFSR

and ORER flag in SCLSR to identify any

error, perform the appropriate error

handling, then clear the DR, ER, BRK, and

ORER flags to 0. In the case of a framing

error, a break can also be detected by

reading the value of the RxD pin.

2. SCIF status check and receive data read:

Read SCFSR and check that RDF = 1, then

read the receive data in SCFRDR, read 1

from the RDF flag, and then 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 data bytes

from SCFRDR, read 1 from the RDF flag,

and then clear the RDF flag to 0. The

number of receive data bytes in SCFRDR

can be ascertained by reading the lower

bits of SCFDR.

Start of reception

End of reception

ER, DR, BRK,

or ORER = 1?

Yes

RDF = 1?

Yes

All data received?

Yes

Error handling

Figure 16.6 Sample Serial Reception Flowchart (1)

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