H8SLASH3003 datasheet(491/715 Pages) RENESAS

491 / 715 page

Receiving Serial Data: Figure 13-18 shows a sample flowchart for receiving serial data and

indicates the procedure to follow. When switching from asynchronous mode to synchronous

mode, make sure that the ORER, PER, and FER flags are cleared to 0. If the FER or PER flag is

set to 1 the RDRF flag will not be set and both transmitting and receiving will be disabled.

Figure 13-18 Sample Flowchart for Serial Receiving (1)

Start receiving

Read RDRF flag in SSR

Read receive data

from RDR, and clear

RDRF flag to 0 in SSR

Read ORER flag in SSR

Clear RE bit to 0 in SCR

End

Error handling

Yes

2., 3.

SCI initialization: the receive data function of

the RxD pin is selected automatically.

Receive error handling: if a receive error

occurs, read the ORER flag in SSR, then after

executing the necessary error handling, clear

the ORER flag to 0. Neither transmitting nor

receiving can resume while the ORER flag

remains set to 1.

SCI status check and receive data read: read

SSR, check that the RDRF flag 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 MSB (bit 7) of the current

frame is received. If the DMAC is activated

by a receive-data-full interrupt request (RXI)

to read RDR, the RDRF flag is cleared

automatically.

Initialize

RDRF = 1?

ORER = 1?

Finished

receiving?

473

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