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8051 Microcontrollers, 2nd Edition by Subrata Ghoshal

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14

EXTERNAL INTERRUPTS

CHAPTER OBJECTIVES

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 very important features, the interrupts. Its distinctive features allow us to subdivide ...

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