Electronics and Communication Engineering - Exam Questions Papers - Discussion
Discussion Forum : Exam Questions Papers - Exam Paper 6 (Q.No. 29)
29.
In 8085 microprocessor system, what will be the total delay provided by the following loop.
where system clock is operating at 3 MHz.
MVI A, 11H
LXI B, 12FFH
Delay: DCX B
XTHL
NOP
XRA B
JNZ Delaywhere system clock is operating at 3 MHz.
Answer: Option
Explanation:
8085 T-States
MVI A, 11H 7
LX1 B, 12FFH 10
Delay: DCX B 6
XTHL 16
NOP 4
XRA B 4
JNZ Delay 10/7
Total T states = 7 + 10 + 255(6 + 16 + 4 + 4 + 7) + 10 = 9462
Therefore total delay introduced = 
= 3.154 m sec.
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