H8S2245 datasheet(501/818 Pages) RENESAS

501 / 818 page

Section 12 Serial Communication Interface (SCI)

Rev.3.00 Mar. 26, 2007 Page 459 of 772

REJ09B0355-0300

Yes

<End>

[1]

Initialization

Start reception

[2]

Yes

Read RDRF flag in SSR

[4]

[5]

Clear RE bit in SCR to 0

Error processing

(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 processing:

If a receive error occurs, read the

ORER flag in SSR , and after

performing the appropriate error

processing, 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 processing

Overrun error processing

[3]

Clear ORER flag in SSR to 0

Note: * The case, in which the DTC

automatically clears the RDRF

flag, occurs only when DISEL in

DTC is 0 with the transfer

counter not being 0. Therefore,

the RDRF flag should be cleared

by CPU when DISEL is 1, or

when DISEL is 0 with the

transfer counter being 0.

Figure 12.18 Sample Serial Reception Flowchart

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