SH7619_09 Datasheet, PDF (472/860 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7619 Series

Section 15 Serial Communication Interface with FIFO (SCIF)
Receiving Serial Data (Synchronous Mode): Figure 15.15 and 15.16 show 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.
Start of reception
Read ORER flag in SCLSR
ORER = 1?
No
Read RDF flag in SCFSR
Yes
[1]
Error handling
[2]
[1] 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.
[2] 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.
No
RDF = 1?
Yes
Read receive data in
SCFRDR, and clear RDF
[3]
flag in SCFSR to 0
No
All data received?
[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
SCFRDR.
Yes
Clear RE bit in SCSCR to 0
End of reception
Figure 15.15 Sample Flowchart for Receiving Serial Data (1)
Error handling
No
ORER = 1?
Yes
Overrun error handling
Clear ORER flag in SCLSR to 0
End
Figure 15.16 Sample Flowchart for Receiving Serial Data (2)
Rev. 6.00 Jul. 15, 2009 Page 432 of 816
REJ09B0237-0600