2

GENERAL ARCHITECTURE

CHAPTER OBJECTIVES

In this chapter, we will learn about some external and internal features of MCS-51 microcontroller. After completion of the chapter, the reader should be able to

  • Name major external signals and their types.
  • Identify minimum input to make the system working.
  • Understand alternate functions of some pins.
  • Explain basic internal architecture of MCS-51.
  • Know details of program memory and data memory.
  • Understand registers, system clock characteristics and reset circuit.

2.1 | External Features

As mentioned in the previous chapter, MCS-51 core is available in many variations. For easier discussions, we select a standard version of MCS-51, the 8051 or XX51. This XX may be replaced by 80, 87 or even by 89C. However, ...

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