Datasheet

Section 12 Serial Communication Interface (SCI)
Rev.7.00 Feb. 14, 2007 page 495 of 1108
REJ09B0089-0700
• Reception
Receive operation should be stopped (by clearing RE to 0) before making a module stop mode
or software standby mode transition. RSR, RDR, and SSR are reset. If a transition is made
without stopping operation, the data being received will be invalid.
To continue receiving without changing the reception mode after the relevant mode is cleared,
set RE to 1 before starting reception. To receive with a different receive mode, the procedure
must be started again from initialization.
Figure 12.26 shows a sample flowchart for mode transition during reception.
Read TEND flag in SSR
TE = 0
Transition to software
standby mode, etc.
Exit from software
standby mode, etc.
Change
operating mode?
No
All data
transmitted?
TEND = 1
Yes
Yes
Yes
<Transmission>
No
No
[1]
[3]
[2]
TE = 1Initialization
<Start of transmission>
[1] Data being transmitted is interrupted.
After exiting software standby mode,
etc., normal CPU transmission is
possible by setting TE to 1, reading
SSR, writing T
DR, and clearing
TDRE to 0, but note that if the DTC
has been activated, the remaining
data in DTCRAM will be transmitted
when TE and TIE are set to 1.
[2] If TIE and TEIE are set to 1, clear
them to 0 in
the same way.
[3] Includes module stop mode.
Figure 12.23 Sample Flowchart for Mode Transition during Transmission