26 For the 8051, what is the content of the ogram counise (P) A PC FFFFH B. PC 0

Question

26 For the 8051, what is the content of the ogram counise (P) A PC FFFFH B. PC 0000H C. PC 3FFFH D. PC value unknown 27. What is the result of NOT (OXAA) A OXAA B. 0x56 C. 0x00 D. 0x55 28. What is the magnitude of the unsigned integer data type? A. 0 to 255 B.-128 to +127 C. 0 to 65,535 D.-32,768 to +32,767 29. What is the frequency of the clock that is being used as the clock source for the timer a) some externally applied frequency f b) controller's crystal frequency f c) controller's crystal frequency /12 d) externally applied frequency/12 30. What is the function of the TMOD register? a) TMOD register is used to set different timer's or counter's to their appropriate modes b) TMOD register is used to load the count of the timer c) Is the destination or the final register where the result is obtained after the operation of the timer d) Is used to interrupt the timer 31. What is the maximum delay that can be generated with the crystal frequency of 24MH2 a) 2.9 sec b) 0.11 m sec c) 32.768 m sec d) 24 m sec

Explanation / Answer

Answer 31: a)

Explanation: For generating the maximum delay we have to multiply the maximum number of counts with the time period required to execute one machine cycle( 65536*1/24MHz).

Answer 30: a)

Explanation: TMOD register is used to set different timer’s or counter’s to their appropriate modes so that it tells the user that what mode is being used when operating any timer or counter.

Answer 29: c)
Explanation: The frequency of the clock source for the timer is equal to f/12( where f is frequency of the crystal ).

Answer 26: b)

Answer 28: c)

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