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- W959978765 abstract "Interrupts are the most important aspect of any embedded system design and potentially can be responsible for many problems when debugging a system. Although they are simple in concept, there are many pitfalls that the unwary can fall into. This chapter discusses the principles behind interrupts. It also explores the different mechanisms that are used with various processor architectures and provides a set of dos and don’ts to help guide the designer. An interrupt is an event from either an internal or an external source where a processor will stop its current processing and switch to a different instruction sequence in response to an event that has occurred either internally or externally. The processor may or may not return to its original processing. There are many sources for interrupts, according to which, interrupts can be internal interrupts, external interrupts, exceptions, software interrupts, and non maskable interrupts. In many embedded systems there are more external sources for interrupts than interrupt pins on the processor. In this case, it is necessary to use an interrupt controller to provide a larger number of interrupt signals. An interrupt controller performs several functions: (1) it provides a large number of interrupt pins that can be allocated to many external devices, (2) it orders the interrupt pins in a priority level so that a high level interrupt will inhibit a lower level interrupt, and (3) it may provide registers for each interrupt pin which contain the vector number to be used during an acknowledge cycle." @default.
- W959978765 created "2016-06-24" @default.
- W959978765 creator A5034102911 @default.
- W959978765 date "2002-01-01" @default.
- W959978765 modified "2023-09-24" @default.
- W959978765 title "Interrupts and exceptions" @default.
- W959978765 doi "https://doi.org/10.1016/b978-075065546-0/50007-4" @default.
- W959978765 hasPublicationYear "2002" @default.
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