HD6432633 Datasheet, PDF (816/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

• 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
No [1]
Read TEND flag in SSR
TEND = 1
Yes
TE= 0
No
[2]
[1] Data being transmitted is interrupt-
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.
[2] If TIE and TEIE are set to 1, clear
them to 0 in the same way.
Transition to software
standby mode, etc.
[3]
Exit from software
standby mode, etc.
Change
No
operating mode?
Yes
[3] Includes module stop mode, watch
mode, subactive mode, and sub-
sleep mode.
Note: * The DTC function is not
available in the H8S/2695.
Initialization
TE= 1
<Start of transmission>
Figure 16-25 Sample Flowchart for Mode Transition during Transmission
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