SH7721 datasheet(683/1524 Pages) RENESAS

683 / 1524 page

Section 18

Serial Communication Interface with FIFO (SCIF)

Rev. 3.00 Jan. 18, 2008 Page 621 of 1458

REJ09B0033-0300

(5)

Transmitting and Receiving Data (Serial data reception)

Figures 18.7 and 18.8 show sample serial reception flowcharts. After SCIF reception is enabled,

use the following procedure to perform serial data reception.

Start reception

Read PER and FER

flags in SCSSR

All data received?

End reception

Yes

PER or FER = 1?

RDF = 1?

Yes

Clear RE bit in SCSCR to 0

Read RDF flag in SCSSR

Error processing

Read receive data in SCFRDR,

and clear RDF flag in

SCSSR to 0

(1) Receive error handling and break

detection:

Read the DR, ER, and BRK flags in

SCSSR2 to identify any error, perform

the appropriate error handling, then

clear the DR, ER, and BRK flags to 0.

In the case of a framing error, a break

can also be detected by reading the

value of the RxD2 pin.

(2) SCIF status check and receive data

read :

Read the serial status register

(SCSSR) and check that RDF = 1, then

read the receive data in the receive

FIFO data register (SCFRDR), read 1

from the RDF flag, and then clear the

RDF flag to 0.

(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 the lower bits of

SCFDR.

(1)

(2)

(3)

Figure 18.7

Sample Serial Reception Flowchart (1)

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