SH7261 datasheet(746/1348 Pages) RENESAS

746 / 1348 page

Section 16 Serial Communication Interface with FIFO (SCIF)

Rev. 2.00 Sep. 07, 2007 Page 714 of 1312

REJ09B0320-0200

• Receiving Serial Data (Asynchronous Mode)

Figures 16.6 and 16.7 show sample flowcharts for serial reception.

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

Start of reception

Read ER, DR, BRK flags in

SCFSR and ORER

flag in SCLSR

ER, DR, BRK or 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 and break detection:

Read the DR, ER, and BRK flags in SCFSR, and the

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 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 from

SCRFDR.

[1]

[2]

[3]

Figure 16.6 Sample Flowchart for Receiving Serial Data

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