HD6433644R datasheet(346/549 Pages) RENESAS

346 / 549 page

Section 10 Serial Communication Interface

Rev. 6.00 Sep 12, 2006 page 326 of 526

REJ09B0326-0600

Receiving: Figure 10.18 shows an example of a flowchart for data reception. This procedure

should be followed for data reception after initializing SCI3.

Start

End

Read bit OER

in SSR

Read bit RDRF

in SSR

Overrun error

processing

Clear bit OER to

0 in SSR

Read receive

data in RDR

Clear bit RE to

0 in SCR3

Yes

OER = 1?

RDRF = 1?

Yes

Continue data

reception?

Yes

Overrun error

processing

End of overrun

error processing

Start overrun

error processing

Read bit OER in the serial status register

(SSR) to determine if there is an error.

If an overrun error has occurred, execute

overrun 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 MSB (bit 7) of the current

frame. When the data in RDR is read,

bit RDRF is cleared to 0 automatically.

If an overrun error has occurred, read bit

OER in SSR, and after carrying out the

necessary error processing, clear bit OER

to 0. Reception cannot be resumed if bit

OER is set to 1.

Figure 10.18 Example of Data Reception Flowchart (Synchronous Mode)

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