Datasheet

Section 14 Serial Communication Interface 3 (SCI3)
Rev. 6.00 Mar. 24, 2006 Page 222 of 412
REJ09B0142-0600
Reception cannot be resumed while a receive error flag is set to 1. Accordingly, clear the OER,
FER, PER, and RDRF bits to 0 before resuming reception. Figure 14.13 shows a sample flowchart
for serial data reception.
Yes
<End>
No
Start reception
[1]
[4]
No
Yes
Read RDRF flag in SSR [2]
[3]
Clear RE bit in SCR3 to 0
Error processing
(Continued below)
Read receive data in RDR
Yes
No
OER = 1
RDRF = 1
All data received?
Read OER flag in SSR
<End>
Error processing
Overrun error processing
Clear OER flag in SSR to 0
[4]
[1] Read the OER flag in SSR to determine
if there is an error. If an overrun error
has occurred, execute overrun error
processing.
[2] Read SSR and check that the RDRF
flag is set to 1, then read the receive
data in RDR. When data is read from
RDR, the RDRF flag is automatically
cleared to 0.
[3] To continue serial reception, before the
MSB (bit 7) of the current frame is
received, reading the RDRF flag and
reading RDR should be finished. When
data is read from RDR, the RDRF flag
is automatically cleared to 0.
[4] If an overrun error occurs, read the
OER flag in SSR, and after performing
the appropriate error processing, clear
the OER flag to 0. Reception cannot be
Figure 14.13 Sample Serial Reception Flowchart (Clocked Synchronous Mode)