HD6433644R datasheet(353/549 Pages) RENESAS

353 / 549 page

Section 10 Serial Communication Interface

Rev. 6.00 Sep 12, 2006 page 333 of 526

REJ09B0326-0600

Start

End

Read bits OER

and FER in SSR

Set bit MPIE to 1

in SCR3

Read bit RDRF

in SSR

Read receive

data in RDR

Clear bit RE to

0 in SCR3

Yes

OER + FER = 1?

RDRF = 1?

Yes

Continue data

reception?

Yes

Read bits OER

and FER in SSR

Own ID?

Yes

Read bit RDRF

in SSR

Yes

OER + FER = 1?

Read receive

data in RDR

RDRF = 1?

Yes

Receive error

processing

(A)

Set bit MPIE to 1 in SCR3.

Read bits OER and FER in the serial

status register (SSR) to determine if

there is an error. If a receive error has

occurred, execute receive error processing.

Read SSR and check that bit RDRF is

set to 1. If it is, read the receive data in

RDR and compare it with this receiver's

own ID. If the ID is not this receiver's,

set bit MPIE to 1 again. When the RDR

data is read, bit RDRF is cleared to 0

automatically.

Read SSR and check that bit RDRF is

set to 1, then read the data in RDR.

If a receive error has occurred, read bits

OER and FER in SSR to identify the error,

and after carrying out the necessary error

processing, ensure that bits OER and FER

are both cleared to 0. Reception cannot be

resumed if either of these bits is set to 1.

In the case of a framing error, a break can

be detected by reading the value of the

RXD pin.

Figure 10.24 Example of Multiprocessor Data Reception Flowchart

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