Section 27 Serial Communication Interface with FIFO (SCIF)
Rev. 1.00 Oct. 01, 2007 Page 1109 of 1956
REJ09B0256-0100
(5) Serial Data Reception (Clocked Synchronous Mode)
Figure 27.19 shows a sample flowchart for serial reception.
Use the following procedure for serial data reception after enabling the SCIF for reception.
When switching the operating mode from asynchronous mode to clocked synchronous mode
without initializing the SCIF, make sure that the ORER, PER7 to PER0, and FER7 to FER0 flags
are cleared to 0.
Start of reception
Read ORER flag in SCLSR
ORER = 1?
Read RDF flag in SCFSR
Initialization
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] SCIF initialization:
See Sample SCIF Initialization
Flowchart in figure 27.16.
[2] Receive error handling:
Read the ORER flag in SCLSR to
identify any error, perform the
appropriate error handling, then clear
the ORER flag to 0.
Transmission/reception cannot be
resumed while the ORER flag is set
to 1.
[3] SCIF status check and receive data
read:
Read SCFSR and check that RDF =
1, then read the receive data in
SCFRDR, and clear the RDF flag to
0. The transition of the RDF flag from
0 to 1 can also be identified by an
RXI interrupt.
[4] 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 SCFRDR.
[1]
[2]
[4]
[3]
Figure 27.19 Sample Serial Reception Flowchart (1)
Содержание SH7763
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