HD6433636SW datasheet(266/418 Pages) RENESAS

266 / 418 page

252

Start

Read bits OER, PER, and

FER in SSR

Read bit RDRF in SSR

Continue receiving?

Clear bit RE in SCR3 to 0

End

Yes

1. Read bits OER, PER, and

FER in the serial status

determine if a receive

error has occurred.

If a receive error has

occurred, receive error

processing is executed.

OER = 1?

FER = 1?

PER = 1?

Clear bits OER, PER, and

FER in SSR to 0

Overrun error

processing

Break?

Framing error

processing

Parity error

processing

Yes

Receive error processing

End receive error

processing

Start receive

error processing

OER + PER +

FER = 1

RDRF = 1?

Yes

2. Read the serial status register

(SSR), and after confirming

that bit RDRF = 1, read

received data from the receive

data register (RDR).

When RDR data is read, RDRF

is automatically cleared to 0.

3. To continue receiving data,

read bit RDRF and finish

reading RDR before the stop

bit of the present frame is

received.

When data is read from RDR,

RDRF is automatically cleared

to 0.

4. When a receive error occurs,

read bits OER, PER, and FER

in SSR to determine which

error (s) occurred.

After the necessary error

processing, be sure to clear

the above bits all to 0.

Data receiving cannot be resumed

while any of bits OER, PER, or

FER is set to 1.

When a framing error occurs,

a break can be detected by

reading the RXD pin value.

Read received data in RDR

Figure 10.10 Typical Serial Data Receiving Flow Chart in Asynchronous Mode

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