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Q#1
Microprocessor
GATE EE 2006
MCQ
+2 marks
-0.66 marks
A software delay subroutine is written as given below:
How many times DCR L instruction will be executed?
255
510
65025
65279
Explanation:
In the first iteration, the value of register L is decremented from 25510 to 010. So, DCR L is executed 255 times.
In rest of 254 iterations the value of register L is decremented from 00H to 00H i.e. the value is decremented 256 times.
Hence, DCR L instruction is executed = 255 + 254 x 256 = 65,279 times
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