1. Receive error handling and
break detection: If a receive
error occurs, read the ORER,
PER, and FER flags in
Start of reception
Read ORER, PER, and FER flags
in SCSSR1
SCSSR1 to identify the error.
After performing the
appropriate error handling,
ensure that the ORER, PER,
and FER flags are all cleared to
0. Reception cannot be
Yes
PER or FER
or ORER = 1?
resumed if any of these flags
are set to 1. In the case of a
framing error, a break can be
detected by reading the value
of the RxD pin.
No
Error handling
Read RDRF flag in SCSSR1
No
2. SCI status check and receive
data read : Read SCSSR1 and
check that RDRF = 1, then read
the receive data in SCRDR1
and clear the RDRF flag to 0.
RDRF = 1?
Yes
Read receive data in SCRDR1,
and clear RDRF flag
3. Serial reception continuation
procedure: To continue serial
reception, complete zero-
clearing of the RDRF flag
before the stop bit for the
current frame is received. (The
RDRF flag is cleared
in SCSSR1 to 0
No
All data received?
Yes
automatically when the direct
memory access controller
(DMAC) is activated by an RXI
interrupt and the SCRDR1
value is read.)
Clear RE bit in SCSCR1 to 0
End of reception
Figure 15.10 Sample Serial Reception Flowchart (1)
Rev. 6.0, 07/02, page 630 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
