H8SLASH3003 datasheet(476/715 Pages) RENESAS

476 / 715 page

Receiving Serial Data (Asynchronous Mode): Figure 13-7 shows a sample flowchart for

receiving serial data and indicates the procedure to follow.

Figure 13-7 Sample Flowchart for Receiving Serial Data (1)

Start receiving

Read RDRF flag in SSR

RDRF = 1?

Read receive data

from RDR, and clear

RDRF flag to 0 in SSR

PER

RER

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. If the DMAC is activated

by an RXI interrupt to read the RDR value,

the RDRF flag is cleared automatically.

Read ORER, PER,

and FER flags in SSR

Initialize

∨∨

458

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