H8SLASH3021 datasheet(392/712 Pages) RENESAS

392 / 712 page

11. Serial Communication Interface

Rev.2.00 Mar. 22, 2007 Page 368 of 684

REJ09B0352-0200

Receiving Serial Data (Asynchronous Mode): Figure 11.7 shows a sample flowchart for

receiving serial data and indicates the procedure to follow.

Start receiving

Read RDRF flag in SSR

RDRF = 1?

Read receive data

from RDR, and clear

RDRF flag to 0 in SSR

PER

FER

ORER = 1?

Clear RE bit to 0 in SCR

Finished

receiving?

End

Error handling

(continued on next page)

Yes

2., 3.

SCI initialization: the receive data function of

the RxD pin is selected automatically.

Receive error handling and break

detection: if a receive error occurs, read the

ORER, PER, and FER flags in SSR to identify

the error. After executing the necessary error

handling, clear the ORER, PER, and FER

flags all to 0. Receiving cannot resume if any

of the ORER, PER, and FER flags remains

set to 1. When a framing error occurs, the

RxD pin can be read to detect the break state.

SCI status check and receive data read: read

SSR, check that RDRF is set to 1, then read

receive data from RDR and clear the RDRF

flag to 0. Notification that the RDRF flag has

changed from 0 to 1 can also be given by the

RXI interrupt.

To continue receiving serial data: check the

RDRF flag, read RDR, and clear the RDRF

flag to 0 before the stop bit of the current

frame is received.

Read ORER, PER,

and FER flags in SSR

Initialize

∨∨

Figure 11.7 Sample Flowchart for Receiving Serial Data (1)

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