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Interrupt priority decoder

Question asked by PRATIBHA SURABHI on May 22, 2020
Latest reply on May 24, 2020 by lama

Hi All,

 

I am referring the MC9S12ZVM-Family RM

In that Chapter 4.4.3 Priority Decoder has a NOTE.

 

Care must be taken to ensure that all exception requests remain active until
the system begins execution of the applicable service routine; otherwise, the
exception request may not get processed at all or the result may be a
spurious interrupt request (vector at address (vector base + 0x0001DC))

 

Can someone please explain what exactly  "care must be taken " here mean.

From a software point of view what exactly are the steps to be taken to ensure the exception request remains active.

 

Thank you in advance

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