Section 12 Serial Communication Interface (SCI)
Rev. 3.00 Sep. 27, 2007 Page 467 of 758
REJ09B0243-0300
Yes
<End>
[1]
No
Initialization
Start reception
No
Yes
[4]
Clear RE bit in SCSCR to 0
Error processing
(Continued on
next page)
[5]
No
Yes
FER = 1? or ORER = 1?
RDRF = 1?
All data received?
Set MPIE bit in SCSCR to 1
[2]
Read ORER and FER flags
in SCSSR
Read RDRF flag in SCSSR
[3]
Read receive data in SCRDR
No
Yes
This station’s ID?
Read ORER and FER flags
in SCSSR
Yes
No
Read RDRF flag in SCSSR
No
Yes
FER = 1? or ORER = 1?
Read receive data in SCRDR
RDRF = 1?
[1] SCI
initialization:
Set the RXD pin using the PFC.
[2] ID reception cycle:
Set the MPIE bit in SCSCR to 1.
[3] SCI status check, ID reception and
comparison:
Read SCSSR and check that the RDRF flag is
set to 1, then read the receive data in SCRDR
and compare it with this station’s ID.
If the data is not this station’s ID, set the MPIE
bit to 1 again, and clear the RDRF flag to 0.
If the data is this station’s ID, clear the RDRF
flag to 0.
[4] SCI status check and data reception:
Read SCSSR and check that the RDRF flag is
set to 1, then read the data in SCRDR.
[5] Receive error processing and break detection:
If a receive error occurs, read the ORER and
FER flags in SCSSR to identify the error.
After performing the appropriate error
processing, ensure that the ORER 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 12.18 Sample Multiprocessor Serial Reception Flowchart (1)
Содержание SH7124 R5F7124
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