HD64F36049 datasheet(367/562 Pages) RENESAS

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Section 17 Serial Communication Interface 3 (SCI3)

Rev. 3.00 Mar. 15, 2006 Page 335 of 526

REJ09B0060-0300

17.6.2

Multiprocessor Serial Data Reception

Figure 17.17 shows a sample flowchart for multiprocessor serial data reception. If the MPIE bit in

SCR3 is set to 1, data is skipped until data with a 1 multiprocessor bit is sent. On receiving data

with a 1 multiprocessor bit, the receive data is transferred to RDR. An RXI interrupt request is

generated at this time. All other SCI3 operations are the same as those in asynchronous mode.

Figure 17.18 shows an example of SCI3 operation for multiprocessor format reception.

Yes

<End>

Start reception

Yes

[4]

Clear RE bit in SCR3 to 0

Error processing

(Continued on

next page)

[5]

Yes

FER+OER = 1

RDRF = 1

All data received?

Set MPIE bit in SCR3 to 1

[1]

[2]

Read OER and FER flags in SSR

Read RDRF flag in SSR

[3]

Read receive data in RDR

Yes

[A]

This station's ID?

Read OER and FER flags in SSR

Yes

Read RDRF flag in SSR

Yes

FER+OER = 1

Read receive data in RDR

RDRF = 1

[1]

Set the MPIE bit in SCR3 to 1.

[2]

Read OER and FER in SSR to check for

errors. Receive error processing is performed

in cases where a receive error occurs.

[3]

Read SSR and check that the RDRF flag is

set to 1, then read the receive data in RDR

and compare it with this station’s ID.

If the data is not this station’s ID, set the MPIE

bit to 1 again.

When data is read from RDR, the RDRF flag

is automatically cleared to 0.

[4]

Read SSR and check that the RDRF flag is

set to 1, then read the data in RDR.

[5]

If a receive error occurs, read the OER and

FER flags in SSR to identify the error. After

performing the appropriate error processing,

ensure that the OER and FER flags are all

cleared to 0.

Reception cannot be resumed if either of

these flags is set to 1.

In the case of a framing error, a break can be

detected by reading the RxD pin value.

Figure 17.17 Sample Multiprocessor Serial Reception Flowchart (1)

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