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(4)
Shutdown of the FCAN system
If the clock to the CAN interface should be switched off for power saving, the following sequence
has to be executed for correct termination of any CAN bus activity:
<1> For each CAN module x (x = 1 to 4 for the derivatives µPD703129(A) and
µPD703129(A1), x = 1 to 2 for the derivative µPD703128(A)).
<a> Enter sleep mode
Set SLEEP bit = 1 (CxCTRL register)
or
<b> Enter initialisation mode
Set INIT bit = 1 (CxCTRL register) and wait for ISTAT bit = 1
<2> Disable event processing
Clear EVM flag (CGST register)
<3> Stop the CAN global time system counter
Clear the TSM flag (CGST register)
<4> Stop the global CAN operation
Clear GOM flag (CGST register)
<5> Switch off the CAN clock
Set CSTP bit (CSTOP register)
Caution:
If the sequence is not observed, any active CAN module may cause malfunction on
the corresponding CAN bus.
Chapter 14 FCAN Interface Function
Preliminary User's Manual U15839EE1V0UM00
521
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