Question

2. After initialization a user executes the following instructions: ORGO 0000 MOV A, #30H 0002 PUSH A 0003 LCALL 0500H 0006 .. What are the contents of memory locations 8, 9 and 10 after the LCALL? (A) OSH OOH 30H (B) 30H OOH O5H (C) 30H 06H OOH (D) none of the above 3. If in question #2 a RET instruction is assembled and located at 0500H. The next instruction executed after this RET will be the instruction at memory location 0006H. (A) TRUE (B) FALSE

Answer 1

Answer is as follows :

Answer 1 :

As in given instructions :

MOV A , #30 H // Data 30 H is moved to register A

PUSH A // Push value of register into stack , So TOP of stack contains 30 H i.e. location 8

LCALL 0500 H // The memory address 0500H is called and higher bits i.e. 00 H is stored on stack at memory location 9 and lower bits 05 H stored on stack at memory location 10.

So memory locations contains :

address 8 = 30 H

address 9 = 00 H

address 10 = 05 H

So these match with option B.

So correct option is B

Answer 2 :

If RET i.e return instruction is located at memory location 0500H than control get back at same instruction LCALL i.e. located at 0003 addressed. Than next instruction located on address 0006 is executed.

So statement is TRUE .

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