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Electronics and Communication Engineering - Microprocessors

Exercise : Microprocessors - Section 10
21.

Assertion (A): A two byte instruction of 8085 has an operation code in first byte and operand / address in the second byte.

Reason (R): If an instruction is too long it is possible to reduce its length by a number of methods.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct R is wrong
A is wrong R is correct
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
In computers the size of secondary memory is usually much larger than that of primary memory.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
In 8085
all operations are on 8 bit data
majority of operations are on 8 bit data
all operations are on 8 bit or 4 bit data
either (a) or (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Which of the following directives in 8085 causes two bytes to be reserved in the memory?
D S
D B
D W
E Q U
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
In 8086 the flag which enables or disables external interrupts is
IF
DF
TF
CF
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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