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Section 14 Serial Communication Interface 3 (SCI3)
14.6.2 Multiprocessor Serial Data Reception
Figure 14.17 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 received. 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 in asynchronous mode. Figure
14.18 shows an example of SCI3 operation for multiprocessor format reception.
Start reception
Set MPIE bit in SCR3 to 1
[1]
Read OER and FER flags in SSR [2]
FER+OER = 1
Yes
No
Read RDRF flag in SSR
[3]
No
RDRF = 1
Yes
Read receive data in RDR
No
This station's ID?
Yes
Read OER and FER flags in SSR
Yes
FER+OER = 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.
No
Read RDRF flag in SSR
RDRF = 1
Yes
Read receive data in RDR
[4]
No
[5]
Error processing
(Continued on
next page)
Yes
All data received?
No
[A]
Clear RE bit in SCR3 to 0
<End>
Figure 14.17 Sample Multiprocessor Serial Reception Flowchart (1)
Rev. 6.00 Mar. 24, 2006 Page 227 of 412
REJ09B0142-0600