Embedded Control Applications Using AT 89S52

This chapter is a complete diversion from the PIC16F877. Here we are back to a very popular CISC architecture i.e. Atmel 89S52. Let us justify the reasons for the departure from what follows right away since Chapter 2. At the outset, we submit that the talk of the town “RISC versus CISC debate” has almost come to an end with the state of art complex microprocessor architectures, ASICs and commercial offthe- shelf (COTS) architectures. However, the market statistics won’t forgive us if we ignore the fact that today the MCS51 series accounts for the more than 25% of the 8 bit Microcontroller worldwide market, with part volumes exceeding 100,000,000 or more units per annum. We must give justice to the investment to the tune of billions of dollars and most importantly programming expertise that comes from millions of programmer hours apart from the efforts taken to launch full proof IDEs, compliers, debuggers and other tools. Therefore we have taken the most popular representative sample of MCS51 series i.e. Atmel 89S52 for the applications chosen in this chapter. Following case studies are developed in this chapter:

• 1. 6.1 Night Lamp Controller

• 2. 6.2 Microcontroller Based Control for Nylon Rubber Stamp Making Machine Control

• 3. 6.3 A Tiny BIOS or Diagnostic Interface with MCS51

• 4. 6.4 Simple Digital IC Tester

• 5. 6.5 Microcontroller Based Salinity Measurement System

• 6. 6.6 Fault Tolerant Sensor Interface

• 7. 6.7 Sensor Matrix Interface

• 8. 6.8 Design Micricontroller Based Servo Controller