HD64F36022 datasheet(230/384 Pages) RENESAS

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Section 13 Serial Communication Interface 3 (SCI3)

Rev. 4.00 Sep. 23, 2005 Page 204 of 354

REJ09B0025-0400

Yes

<End>

Start reception

[1]

[4]

Yes

Read RDRF flag in SSR

[2]

[3]

Clear RE bit in SCR3 to 0

Error processing

(Continued below)

Read receive data in RDR

Yes

OER = 1

RDRF = 1

All data received?

Read OER flag in SSR

<End>

Error processing

Overrun error processing

Clear OER flag in SSR to 0

[4]

[1]

Read the OER flag in SSR to determine if

there is an error. If an overrun error has

occurred, execute overrun error processing.

[2]

Read SSR and check that the RDRF flag is

set to 1, then read the receive data in RDR.

When data is read from RDR, the RDRF

flag is automatically cleared to 0.

[3]

To continue serial reception, before the

MSB (bit 7) of the current frame is received,

reading the RDRF flag and reading RDR

should be finished. When data is read from

RDR, the RDRF flag is automatically

cleared to 0.

[4]

If an overrun error occurs, read the OER

flag in SSR, and after performing the

appropriate error processing, clear the OER

flag to 0. Reception cannot be resumed if

the OER flag is set to 1.

Figure 13.13 Sample Serial Reception Flowchart (Clocked Synchronous Mode)

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