Free Electronic Circuits & 8085 projects

Electronic projects with circuit diagram and 8085 microprocessor projects.

Generate a delay of 0.4 seconds

Published on Nov 17 2009 // Trainees

Statement: Write a program to generate a delay of 0.4 sec if the crystal frequency is 5 MHz.

Calculation: In 8085, the operating frequency is half of the crystal frequency,

ie.Operating frequency    = 5/2 = 2.5 MHz

Time for one T -state     =

Number of T-states required   =   1 x 106

Source program :

  • LXI B, count : 16 – bit count
  • BACK: DCX B : Decrement count
  • MOV A, C
  • ORA B : Logically OR Band C
  • JNZ BACK : If result is not zero repeat

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