HD6433644R datasheet(339/549 Pages) RENESAS

339 / 549 page

Section 10 Serial Communication Interface

Rev. 6.00 Sep 12, 2006 page 319 of 526

REJ09B0326-0600

Receiving: Figure 10.13 shows an example of a flowchart for data reception. This procedure

should be followed for data reception after initializing SCI3.

Start

End

Read bits OER,

PER, FER in SSR

Read bit RDRF

in SSR

Read receive

data in RDR

Clear bit RE to

0 in SCR3

Yes

OER + PER

+ FER = 1?

RDRF = 1?

Yes

Continue data

reception?

Yes

Receive error

processing

(A)

Read bits OER, PER, 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. When the RDR data is read,

bit RDRF is cleared to 0 automatically.

When continuing data reception, finish

reading of bit RDRF and RDR before

receiving the stop bit of the current

frame. When the data in RDR is read,

bit RDRF is cleared to 0 automatically.

If a receive error has occurred, read bits

OER, PER, and FER in SSR to identify

the error, and after carrying out the

necessary error processing, ensure that

bits OER, PER, and FER are all cleared

to 0. Reception cannot be resumed if

any 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.4.

Figure 10.13 Example of Data Reception Flowchart (Asynchronous Mode)

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