HD64F2149YV datasheet(509/1075 Pages) RENESAS

509 / 1075 page

Section 15 Serial Communication Interface (SCI, IrDA)

Rev. 3.00 Jan 18, 2006 page 481 of 1044

REJ09B0280-0300

Yes

<End>

[1]

Initialization

Start reception

[2]

Yes

Read RDRF flag in SSR

[4]

[5]

Clear RE bit in SCR to 0

Error handling

(Continued below)

[3]

Read receive data in RDR, and

clear RDRF flag in SSR to 0

Yes

ORER = 1?

RDRF = 1?

All data received?

Read ORER flag in SSR

[1]

[2] [3]

[4]

[5]

SCI initialization:

The RxD pin is automatically

designated as the receive data

input pin.

Receive error handling:

If a receive error occurs, read the

ORER flag in SSR , and after

performing the appropriate error

handling, clear the ORER flag to

0. Transfer cannot be resumed if

the ORER flag is set to 1.

SCI status check and receive

data read:

Read SSR and check that the

RDRF flag is set to 1, then read

the receive data in RDR and

clear the RDRF flag to 0.

Transition of the RDRF flag from

0 to 1 can also be identified by

an RXI interrupt.

Serial reception continuation

procedure:

To continue serial reception,

before the MSB (bit 7) of the

current frame is received, finish

reading the RDRF flag, reading

RDR, and clearing the RDRF flag

to 0. The RDRF flag is cleared

automatically when the DTC is

activated by a receive-data-full

interrupt (RXI) request and the

RDR value is read.

<End>

Error handling

Overrun error handling

[3]

Clear ORER flag in SSR to 0

Figure 15.18 Sample Serial Reception Flowchart

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