The DPTR is A a 16-bit register B. a 20-bit register C. an 8-bit register Check

Question

The DPTR is A a 16-bit register B. a 20-bit register C. an 8-bit register Check for correct choices D. a 12-bit register 13. What is the largest value that can be contained in register R7? FH FH B. C. 0FFFH 14. What are the values of the auxiliary carry flag (AC) and the carry flag (cY after the follow MOV A, #5CH ADD A, #2AH A. AC-0, CY 0 B. AC 0, CY 1 C)AC- 1, CY 0 D. AC 1, CY 1 15. What are the values of the carry flag (CY) and the overflow flag (ov) after the following MOV A, -120; A 1000 1000 MOV R4, #-10; R4 1111 0110 ADD A, R4 A. CY 0, OV 0 B. CY 0, OV 1 CY 1, OV D. CY 1, OV 1

Explanation / Answer

12. DPTR is a 16 bit register

13. Register R7 can store 8 bit i.e FFH

14. AC =1 , CY=0

15. CY=1, OV=1

16. LCALL is a 3 byte instruction

17. LJMP is used to jump any where in the memory location from 0000 to FFFFH

18. 07H

19. 87H

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