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Initialize
Start receiving
Set MPIE bit to 1 in SCR
Read ORER and FER flags
in SSR
FERγORER = 1
Read RDRF flag in SSR
No
RDRF = 1
Yes
Read RDRF flag in SSR
No
Own ID?
Yes
Read ORER and FER flags
in SSR
FERγORER = 1
Read RDRF flag in SSR
RDRF = 1
Yes
Read receive data from RDR
No
Finished receiving?
Yes
Clear RE bit to 0 in SCR
<End>
Figure 13.12 Sample Flowchart for Receiving Multiprocessor Serial Data (1)
(1)
(2)
Yes
No
(3)
Yes
No
(4)
No
(5)
Error handling
(continued on next page)
Section 13 Serial Communication Interface
(1)
SCI initialization:
the receive data input function of the
RxD pin is selected automatically.
(2)
ID receive cycle:
set the MPIE bit to 1 in SCR.
(3)
SCI status check and ID check:
read SSR, check that the RDRF flag
is set to 1, then read data from RDR
and compare it with the processor's
own ID. If the ID does not match, set
the MPIE bit to 1 again and clear the
RDRF flag to 0. If the ID matches,
clear the RDRF flag to 0.
(4)
SCI status check and data receiving:
read SSR, check that the RDRF flag
is set to 1, then read data from RDR.
(5)
Receive error handling and break
detection:
if a receive error occurs, read the
ORER and FER flags in SSR to
identify the error. After executing the
necessary error handling, clear the
ORER and FER flags both to 0.
Receiving cannot resume while either
the ORER or FER flag remains set to
1. When a framing error occurs, the
RxD pin can be read to detect the
break state.
Rev. 4.00 Jan 26, 2006 page 523 of 938
REJ09B0276-0400
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