SAMPLE PROGRAM:
mov a,#10h;
mov r2,#10h;
mov r0,a;
mov r1,#30h;
mov r1,r0;
mov 10h,#FFh;
1. Write down the hex code for the instructions and differentiate opcodes and operands.
Ans:-
|
Instruction |
Hex Code |
|
Mov a, #10h |
74 |
|
Mov r2, #10h |
7A |
|
Mov r0, a |
F8 |
|
Mov r1, #30h |
79 |
|
Mov 10h, FFh# |
75 |
Opcode is the first
instruction that the CPU reads after turn on.
Operand is a variable
that stores data.
2. What is size of registers in program?
Ans: a: 8-bit
R0: 8-bit
R1: 8-bit
R2: 8-bit
3. What will be the contents of the PC at the instruction mov r0, a?
Ans:
05h
4. Mention addressing mode of each instruction.
Ans:
mov a,#10h; immediate
mov r2,#10h; direct
mov r0,a; register
mov r1,#30h; direct
mov r1,r0; register
mov 10h,#FFh; direct
5. Write instructions to transfer the value 10H to internal RAM location 8H, external ram location 0008H and 0100H.
Ans:
Mov a, #10h
Mov dptr, #8h
Mov @dptr, a
Movx @dptr, a
Mov dptr, #100h
Movx @dptr, a
6. Write an instruction or a set of instructions to transfer a byte from internal RAM location 7H to external RAM location 0007H, 0010H and 0100H.
Ans:
Mov a, 7h
Mov dptr, #7h
Movx @dptr, a
Mov dptr, #10h
Movx @dptr, a
Mov dptr, #100h
Movx @dptr, a
7.
Do
inverse of program 6.
Ans:
Mov r0, #7h
Movx a, @r0
Mov 7h, a
Mov r0, #10h
Movx a, @r0
Mov 7h, a
Mov r0, #100h
Movx a, @r0
Mov 7h, a
8.
Write
a program to transfer byte from code memory to internal RAM and external RAM
Ans:
Mov a, #5h
Mov dptr, #4h
Movc a,@a+dptr
Mov 10h, a
Mov r0, #12h
Mov @r0, a
10. Write a program to transfer byte from external RAM to external ROM
Ans:
Mov dptr, #20h
Movx a, @dptr
Movc a, @a+dptr
11. Write a program to transfer byte from internal RAM to internal ROM.
Ans:
Mov a, 20h
Mov dptr, 10h
Movc
a, @a+dptr
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