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Revision 1.6TTCAN
11.11.02
manual_about.fm
basic cycle will continue until its last time window. The time after the last time window is the
Gap time.
In nodes that are time slaves, the Gap bit will remain at ‘0’. In the actual time master and in
potential time masters, the Gap bit will be set when the last basic cycle has finished and the
Gap time starts.
The Gap is finished by setting FGp to ‘1’. There are three ways to set FGp. FGp can be set by
the CPU directely. Another method to set FGp is using the TMI interrupt: When TMG is set to
‘1’, the next TMI will set FGp. The third way to set FGp is using the EVENT_TRIGGER input
pin: When EPE is set to ‘1’, an edge from high to low at the EVENT_TRIGGER will set FGp.
When FGp is set after the Gap time has started, that event will start the transmission of a
Reference Message immediately and will thereby synchronise the message schedule.
When FGp is set before the Gap time has started (when the Basic Cycle is still in progress),
the next Reference Message will be started at the end of the Basic Cycle, at the
Tx_Ref_Trigger – there will be no Gap time in the message schedule.