HD64F2149YV datasheet(491/1075 Pages) RENESAS

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Section 15 Serial Communication Interface (SCI, IrDA)

Rev. 3.00 Jan 18, 2006 page 463 of 1044

REJ09B0280-0300

Serial Data Reception (Asynchronous Mode): Figure 15.7 shows a sample flowchart for serial

reception.

The following procedure should be used for serial data reception.

Yes

<End>

[1]

Initialization

Start reception

[2]

Yes

Read RDRF flag in SSR

[4]

[5]

Clear RE bit in SCR to 0

Read ORER, PER, and

FER flags in SSR

Error handling

(Continued on next page)

[3]

Read receive data in RDR, and

clear RDRF flag in SSR to 0

Yes

PER

∨ FER ∨ ORER = 1?

RDRF = 1?

All data received?

SCI initialization:

The RxD pin is automatically

designated as the receive data

input pin.

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

performing the appropriate error

handling, ensure that the ORER,

PER, and FER flags are all

cleared to 0. Reception cannot

be resumed if any of these flags

are set to 1. In the case of a

framing error, a break can be

detected by reading the value of

the input port corresponding to

the RxD pin.

SCI status check and receive

data read :

Read SSR and check that RDRF

= 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 stop bit for the current

frame is received, read the

RDRF flag, read RDR, and clear

the RDRF flag to 0. The RDRF

flag is cleared automatically

when the DTC is activated by an

RXI interrupt and the RDR value

is read.

[1]

[2] [3]

[4]

[5]

Figure 15.7 Sample Serial Reception Data Flowchart

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