In this chapter, the reader is introduced to 8051 interrupts in general and its
external interrupts in particular. After completion of the chapter, the reader
should be able to understand
• Overall functioning of interrupts.
• How an external interrupt works.
• Vector addresses for interrupts.
• Priority of interrupts.
• Application of special function registers (SFRs) related to the external
interrupts.
• How to develop Interrupt Service Routine (ISR).
• How to generate software interrupts
14.1 | Introduction
As we have completed the discussions on the software instruction set of MCS-51, we may now be introduced
to one of its ...
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