SH7713 datasheet(617/904 Pages) RENESAS

617 / 904 page

Section 16 Serial Communication Interface with FIFO (SCIF)

Rev.1.50 Aug. 30, 2006 Page 577 of 860

REJ09B0288-0150

Serial Data Reception: Figures 16.15 and 16.16 show sample flowcharts for serial reception.

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

To change the operating mode from asynchronous mode to clock synchronous mode without

initialization, be sure to confirm that the flags ORER, PER3 to PER0, and FER3 to FER0 are

cleared to 0.

Yes

Start reception

End reception

Yes

Read RDF flag in SCFSR

Clear RE bit in SCSCR to 0

Read ORER flag in SCLSR

Error handling

Read receive data from SCFRDR

and clear RDF flag in SCFSR to 0

Yes

ORER = 1?

RDF = 1?

All data received?

Initialization

SCIF initialization: See figure 16.3, Sample

SCIF Initialization Flowchart.

Receive error handling: If a receive error

occurs, read the ORER flag in SCLSR, then

after executing the necessary error handling,

clear the ORER flag to 0.

Serial reception cannot be continued while the

ORER flag is set to 1.

SCIF status check and receive data read:

Read SCFSR, check that the RDF flag is set

to 1, then read receive data in SCFRDR and

clear the RDF flag to 0. Notification that the

RDF flag has changed from 0 to 1 can also

be given by the RXI.

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 in SCFRDR can be ascertained by reading

the lower bits of SCFDR. However, if the DMAC

is activated by the RXI and the value is read from

SCFRDR, the RDF flag is cleared automatically.

Figure 16.15 Sample Serial Reception Flowchart

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