HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 788

• Manufacturer Part Number: HD6417641
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 19 Serial Communication Interface with FIFO (SCIF)
• Receiving Serial Data (Synchronous Mode)
Figure 19.15 shows a sample flowchart for receiving serial data. When switching from
asynchronous mode to synchronous mode without SCIF initialization, make sure that ORER, PER,
and FER are cleared to 0.
Rev. 4.00 Sep. 14, 2005 Page 738 of 982
REJ09B0023-0400
No
No
Read ORER flag in SCLSR
Clear RE bit in SCSCR to 0
Figure 19.15 Sample Flowchart for Receiving Serial Data (1)
Read RDF flag in SCFSR
SCFRDR, and clear RDF
Read receive data in
flag in SCFSR to 0
All data received?
Start of reception
End of reception
ORER = 1?
RDF = 1?
No
Yes
Yes
Error handling
[2]
[3]
Yes
[1]
[1] Receive error handling:
[2] SCIF status check and receive data read:
[3] Serial reception continuation procedure:
identify any error, perform the appropriate
error handling, then clear the ORER flag
to 0. Reception cannot be resumed while
the ORER flag is set to 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.
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.
However RDF bits is cleared to 0
automatically when the data in SCFRDR
is read out by the DMAC.
Read the ORER flag in SCLSR to
Read SCFSR and check that RDF = 1,
To continue serial reception, read at least