In this chapter, the reader is introduced to the instructions related with arithmetic operations of MCS-51. After completion of this chapter, the reader should be able to understand how to

  • Use ADD, ADDC, SUBB, INC and DEC instructions.
  • Perform unsigned integer addition and subtraction.
  • Implement multiple byte addition and subtraction.

5.1 | Introduction

In Chapter 4, we learnt how to load and copy 8-bit data from various locations using different addressing modes of 8051. As a matter of fact, except the Program Counter (PC), data may be loaded anywhere and copied from any position to any location. However, all these would be meaningless unless we are able to do some processing with these data. In this ...

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