Question
Download Solution PDFA software delay subroutine is written as given below:
|
DELAY: |
MVI |
H, 255 D |
|
|
MVI |
L, 255 D |
|
LOOP: |
DCR |
L |
|
|
JNZ |
LOOP |
|
|
DCR |
H |
|
|
JNZ |
LOOP |
How many times DCR L instruction will be executed?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFH & L registers initialized with 255 D (i.e. FFH)
(H) = 255 ⇒ (L) is decremented 255 times
(H) = 254 ⇒ (L) is decremented 256 times
(H) = 0 ⇒ Looping terminated.
No. of times execution of DCR L instruction = 255 + (256 × 254) = 65279
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