HD6417751RBP240V Datasheet, PDF (761/1226 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

15. Serial Communication Interface (SCI)
Start of reception
Read ORER flag in SCSSR1
Yes
ORER = 1?
1. Receive error handling: If a
receive error occurs, read the
ORER flag in SCSSR1 , and
after performing the appropriate
error handling, clear the ORER
flag to 0. Transfer cannot be
resumed if the ORER flag is set
to 1.
2. SCI status check and receive
No
Error handling
data read: Read SCSSR1 and
check that the RDRF flag is set
Read RDRF flag in SCSSR1
to 1, then read the receive data
in SCRDR1 and clear the RDRF
flag to 0. Transition of the RDRF
No
RDRF = 1?
flag from 0 to 1 can also be
identified by an RXI interrupt.
Yes
Read receive data in SCRDR1,
and clear RDRF flag
in SCSSR1 to 0
No
All data received?
Yes
Clear RE bit in SCSCR1 to 0
End of reception
3. Serial reception continuation
procedure: To continue serial
reception, finish reading the
RDRF flag, reading SCRDR1,
and clearing the RDRF flag to 0,
before the MSB (bit 7) of the
current frame is received. (The
RDRF flag is cleared
automatically when the direct
memory access controller
(DMAC) is activated by a
receive-data-full interrupt (RXI)
request and the SCRDR1 value
is read.)
Figure 15.22 Sample Serial Reception Flowchart (1)
Rev.4.00 Oct. 10, 2008 Page 661 of 1122
REJ09B0370-0400