The content in Accumulator A is not specified or you do not need to know what is

Question

The content in Accumulator A is not specified or you do not need to know what is in Accumulator A Write an instruction sequence to set bits 5, 4, 3&2 in Accumulator A and leave the other four bits (7, 6, 1 &0) unchanged. The new value will be refreshed back to A bit Ans: 4. Write an instruction sequence to clear bits 7, 6,1 &0 in Accumulator A and leave the other four bits (5, 4, 3 &2) unchanged. The new value will be refreshed back to A bit Ans: 5. Write an instruction sequence to toggle bits 5, 4, 3 & 2 in Accumulator A and leave the other four bits (7, 6, 1 & 0) unchanged. The new value will be refreshed back to A bit 7 6 54 3 20 Ans: 6. Write an instruction sequence to clear bits 7, 6, 1 & 0 in Accumulator A and toggle the other four bits (5, 4, 3, &2). The new value will be refreshed back to A. bit 7 6 54 3 20 Ans:

Explanation / Answer

3. ORL A , #3Ah //A's value in bits - xx11 11xx //3A - 0011 1100 OR operation will set the bits.

4. ANL A , #3Ah // A's value in bits - 0011 1100 - 0x3A //3A - 0011 1100 AND operation will give if two value have set 1 otherwise 0 so here it we want to clear 0,1,6 and 7th bit that bit we neet to put 0 so it will be 0.

5. XRL A , #3Ah // As value in bits - 0000 0000 - 0x00 // XOR will togal bit because operation will be like if two values are same put bit 0 and if different put bit 1.

6. AND A,#3Ah // A - 0000 0000 //here 0 AND 0 - 0 so value will be remain 0

XRL A, #3Ah // A - 00111100 // here at 2,3,4,5 0 XOR 1 - so bit will 1 and other bits are we XORing with 0 so they will be 0 only.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.