User`s guide

Hardware Interrupt

Processor Family Valid Interrupt Numbers

C5xxx

2, 3, 5-21, 23

C6xxx

4-15

The width of the block output signal corresponds to the number of

interrupt numbers speciﬁed here. Combined w ith the Simulink

task priorities that you enter and the preemption ﬂag you

enter for each interrupt, these three values deﬁne how the code

and processor handle interrupts during asynchronous scheduler

operations.

Simulink task priorities

Each output of the Hardw are Interrupt block drives a downstream

block (for example, a function call subsystem). Simulink software

task priority speciﬁes the Simulink priority of the downstream

blocks. Specify an array of priorities corresponding to the

interrupt num bers entered in Inte rr upt numbers.

Simulink task priority values are required to generate the proper

rate transition code (refer to Rate Transitions and Asynchronous

Blocks). The task priority values are also required to ensure

absolute time integrity when the a synchro nou s task needs to

obtain real time from its base rate or its caller. Typically , you

assign priorities for these asynchronous tasks that are higher

than the priorities assigned to periodic tasks.

Preemption ﬂagspreemptable–1,non-preemptable–0

Higher priority interrupts can preempt interrupts that have lower

priority. To allow you to control preemption, use the preemption

ﬂags to specify whether an interrupt can b e preempted.

Entering

1 indicates that the in terrupt can be preempted.

Entering

0 indicates the interrupt cannot be preempted. When

Interrupt num bers contains more than one interrupt priority,

you can assign different preempt io n ﬂ ags to each interrupt by

entering a vector of ﬂag values, corresponding to the order of

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