Sunday, September 13, 2009

Generate a delay of 0.4 seconds(8085)

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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