Chapter 3 Introduction to MR308
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3.5.11 Cyclic Handler Function

The cyclic handler is a time event handler that is started every startup cycle after a specified startup phase has
elapsed.
The cyclic handler may be started with or without saving the startup phase. In the former case, the cyclic han-
dler is started relative to the point in time at which it was generated. In the latter case, the cyclic handler is
started relative to the point in time at which it started operating. Figure 3.39 and Figure 3.40 show typical opera-
tions of the cyclic handler.
If the startup cycle is shorter than the time tick interval, the cyclic handler is started only once every time tick
supplied (processing equivalent to isig_tim). For example, if the time tick interval is 10 ms and the startup cycle
is 3 ms and the cyclic handler has started operating when a time tick is supplied, then the cyclic handler is
started every time tick.
Cyclic handler
created
Activation
phase
Activation
cycle
Activation
cycle
Activation
cycle
Activation
cycle
Handler does
not start
Handler does
not start
Start operating Stop operating
Handler does
not start
Handler starts Handler starts
Figure 3.39 Cyclic handler operation in cases where the activation phase is saved
Cyclic handler
created
Activation
phase
Activation
cycle
Activation
cycle
Activation
cycle
Activation
cycle
Handler does
not start
Handler does
not start
Start operating Stop operating
Handler does
not start
Handler starts Handler starts
Figure 3.40 Cyclic handler operation in cases where the activation phase is not saved
• Start Cyclic Handler Operation (sta_cyc, ista_cyc)
Causes the cyclic handler with the specified ID to operational state.
• Stop Cyclic Handler Operation (stp_cyc, istp_cyc)
Causes the cyclic handler with the specified ID to non-operational state.
• Reference Cyclic Handler Status (ref_cyc, iref_cyc)
Refers to the status of the cyclic handler. The operating status of the target cyclic handler and the re-
maining time before it starts next time are inspected.