Generate a delay of 0.4 seconds

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