Section 28 Serial Communication Interface with FIFO/IrDA Interface (SCIF/IrDA)
Rev. 1.00 Oct. 01, 2007 Page 1162 of 1956
REJ09B0256-0100
(5)
Serial Data Reception (Asynchronous Mode)
Figures 28.9 and 28.10 shows a sample flowcharts for serial reception.
Use the following procedure for serial data reception after enabling the SCIF for reception.
Start of reception
Read ER, DR, BRK flags in
SCFSR and ORER
flag in SCLSR
ER, DR, BRK or ORER = 1?
Read RDF flag in SCFSR
RDF = 1?
Read receive data in
SCFRDR, and clear RDF
flag in SCFSR 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:
Read the DR, ER, and BRKflags in SCFSR, and the
ORER flag in SCLSR, to identify any error, perform the
appropriate error handling, then clear the DR, ER, BRK,
and ORER flags to 0. In thecase of a framing error, a
break can also be detected by reading the value of the
SCIF_RXD pin.
[2] SCIF status check and receive data read:
Read SCFSR and check that RDF = 1, then read the
receive data in SCFRDR, read 1 from the RDF flag,
and then clear the RDF flag to 0. The transition of the
RDF flag from 0 to 1 can also be identified by an RXI
interrupt.
[3] Serial reception continuation procedure:
To continue serial reception, read at least the receive
trigger set number of receive data bytes from SCFRDR,
read 1 from the RDF flag, then clear the RDF flag to 0.
The number of receive data bytes in SCFRDR can be
ascertained by reading from SCFDR.
[1]
[2]
[3]
Figure 28.9 Sample Serial Reception Flowchart (1)
Содержание SH7763
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