HD6432351 datasheet(617/1025 Pages) RENESAS

617 / 1025 page

Section 13 Serial Communication Interface (SCI)

Rev. 3.00 Sep 15, 2006 page 583 of 988

REJ09B0330-0300

Serial data reception (asynchronous mode): Figure 13.7 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 processing

(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 processing 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

processing, 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 DMAC or DTC is

activated by an RXI interrupt and

the RDR value is read.

[1]

[2] [3]

[4]

[5]

Figure 13.7 Sample Serial Reception Data Flowchart

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