HD6433636SW datasheet(273/418 Pages) RENESAS

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Receiving: Figure 10.16 shows a typical flow chart for receiving data. After SCI3 initialization,

follow the procedure below.

Start

Read bit OER in SSR

Read bit RDRF in SSR

Read received data in RDR

OER = 1?

Continue

receiving?

Clear bit RE in SCR3 to 0

End

Clear bit OER in

SSR to 0

Read the serial status register (SSR), and after

confirming that bit RDRF = 1, read received

data from the receive data register (RDR).

When data is read from RDR, RDRF is

automatically cleared to 0.

1. Read bit OER in the serial status register (SSR)

to determine if an error has occurred. If an

overrun error has occurred, overrun error

processing is executed.

To continue receiving data, read bit RDRF and

read the received data in RDR before the MSB

(bit 7) of the present frame is received.

When data is read from RDR, RDRF is

automatically cleared to 0.

When an overrun error occurs, read bit OER in

SSR. After the necessary error processing,

be sure to clear OER to 0.

Data receiving cannot be resumed while bit

OER is set to 1.

Yes

RDRF = 1?

Yes

Overrun error

processing

Start overrun

processing

End overrun

error processing

Overrun error processing

Figure 10.16 Typical Data Receiving Flow Chart in Synchronous Mode

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