Section 12 Serial Communication Interface (SCI)
Rev. 3.00 Sep. 27, 2007 Page 451 of 758
REJ09B0243-0300
Receiving Serial Data (Asynchronous Mode):
Figure 12.6 shows a sample flowchart for serial reception.
Use the following procedure for serial data reception after enabling the SCI for reception.
Start of reception
Read ORER, PER, and FER
flags in SCSSR
PER, FER, or ORER = 1?
Read RDRF flag in SCSSR
RDRF = 1?
Read receive data in
SCRDR, and clear RDRF
flag in SCSSR to 0
All data received?
Clear RE bit in SCSCR to 0
End of reception
Yes
No
Yes
Yes
No
No
Error handling
[1] Receive error handling and break
detection:
If a receive error occurs, read the ORER,
PER, and FER flags in SCSSR to identify
the error. After performing the
appropriate error processing, ensure that
the ORER, PER, and FER flags are all
cleared to 0. Reception cannot be
resumed if any of these flags are set to 1.
In the case of a framing error, a break
can also be detected by reading the
value of the RXD pin.
[2] SCI status check and receive data read:
Read SCSSR and check that RDRF = 1,
then read the receive data in SCRDR
clear the RDRF flag to 0.
[3] Serial reception continuation procedure:
To continue serial reception, clear the
RDRF flag to 0 before the stop bit for the
current frame is received.
Figure 12.6 Sample Flowchart for Receiving Serial Data
Summary of Contents for SH7124 R5F7124
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