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• Reception
Receive operation should be stopped (by clearing RE to 0) before making a module stop mode,
software standby mode, watch mode, subactive mode, or subsleep 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 16-28 shows a sample flowchart for mode transition during reception.
<Transmission>
All data
transmitted?
Yes
Read TEND flag in SSR
TEND = 1
Yes
TE= 0
Transition to software
standby mode, etc.
Exit from software
standby mode, etc.
Change
operating mode?
Yes
Initialization
<Start of transmission>
Figure 16-25 Sample Flowchart for Mode Transition during Transmission
654
[1] Data being transmitted is interrupt-
No
[1]
No
[2] If TIE and TEIE are set to 1, clear
[2]
[3]
[3] Includes module stop mode, watch
No
TE= 1
ed. After exiting software standby
mode, etc., normal CPU transmis-
sion is possible by setting TE to 1,
reading SSR, writing TDR, 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.
them to 0 in the same way.
mode, subactive mode, and sub-
sleep mode.
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