36,37,38

SECTION 2.6: 8051 FLAG BITS AND THE PSW REGISTER 31. The PSW is an) -bit register 32. Which bits of PSW are used for the CY and AC flag bits, respectively? 33. Which bits of PSW are used for the OV and P flag bits, respectively? 34. In the ADD instruction, when is CY raised? 35. In the ADD instruction, when is AC raised? 36. What is the value of the CY flag after the following code? CLR CY 0 CPL ; complement carry 37. Find the CY flag value after each of the following codes. (a) MOV A, #54H (b) MOV A, #00 (c) MOV A, #250 ADD A, #0C4H ADD A, #OFFH ADD A, #05 38. Write a simple program in which the value 55H is added 5 times. @ C