22. Executing the instruction MOV P1, A cause's A. the data in A be sent out port P1 for a brief timer interval the value contained in A be sent out port P1 and latched C. register A be set to the value contained in port P1 D. the value in port P1 be set to the constant A 23 What is the result in the accumulator after the execution of the following program segment? MOV A, #55H ANL A, #OFH CPL A A. 55H B. FAH C. AAH 24. Which of the following is always bi-directional? A. The enable line The data bus C. The address bus D. The control bus 25. What is the result of the P1 port after the execution of the following program segment? MOVA, #OFFH MOV P1, A A 8BH B. FFH C. 7BH 26. For the 8051, what is the content of the program counter (PC) upon reset? A. PC= FFFFH B. PC 0000H C. PC 3FFFH D. PC value unknown 27. What is the result of NOT (0xAA)? A. OXAA B. 0x55 C. 0x00 D. 0x58 28. What is the magnitude of the unsigned integer data type? C -128 to +127 B. 0 to 255 C. 0 to 65,535 D. -32,768 to+32,767 29. What is the frequency of the clock that used as the clock source for the timer? a) Externally applied frequency f b) Controller's crystal frequency /12 Controller's crystal frequency d) Externally applied frequency /12 30. What is the function of the TMOD register? a) TMOD register used to load the count of the timer B TMOD register is used to set timers or counter's to their appropriate modes c) Is the destination or the final register where the result obtained after the operation of the timer d) Is used to interrupt timer 31. What is the maximum delay generated with the crystal frequency of 24MHz? a) 2.9 sec b) 32.768 m sec c) 0.11 m sec d) 24 m se