Embedded Systems multiple choice questions with answers Pdf

41. The 8051 microcontroller has a total of ___ bytes of RAM.
Ans. 128

42. The stack is a section of RAM used by the CPU to store information temporarily. (True or False)
Ans. True

43. A ___ is an integrated chip that has a processor, memory and several other hardware units in it.
Ans. Microcontroller

44. Intel family i960 microcontrollers are also called embedded processors. (True or False?)
Ans. True

45. A ___ provides fast, discrete-time, signal-processing instructions.
Ans. DSP

46. A timer circuit suitably configured is the system-clock, also called ___.
Ans. real-time clock (RTC)

47. The system sends the output by a write operation to the port Type. (True or False?)
Ans. False

48. UART stands for ___.
Ans. Universal Asynchronous Receiver and Transmitter

49. ISR stands for ___.
Ans. Interrupt Service Routine

50. ___ converts digital bits to the analog output.
Ans. DAC

51. The glue logic circuit also includes a circuit to interconnect the parallel and serial ports to the peripherals. (True or False) Ans. True

52. PAL has the ___ logic arrays.
Ans. AND – OR

53. In 8051 assembly language, indirect addressing is represented by an ___ before R0 or R1.
Ans. @

54. What is the first part of each instruction called?
Ans. Mnemonic or opcode

55. ____ moves the content of the accumulator to the external memory location whose address is held by DPTR.
Ans. MOVX @DPTR, A

56. Which instruction is used for timing delays to waste clock cycles?
Ans. NOP

57. SETB can operate on the carry flag or any directly addressable bit of a port, register, or RAM location. (True/False?) Ans. True

58. ___ subtracts the src-byte and the carry flag together from the accumulator, leaving the result in the accumulator.
Ans. SUBB

59. Keyboards are organized in a ___ of rows and columns.
Ans. Matrix

60. It is the function of the microcontroller to scan the keyboard continuously to detect and identify the____.
Ans. key pressed

61. These various ways of accessing data are called ___.
Ans. addressing modes

62. ___ addressing can access any on-chip memory location.
Ans. Direct

63. To detect a pressed key, the microcontroller grounds all rows by providing 0 to the output latch, then it reads the columns. (True/False?)
Ans. True

64. The first criterion for judging a DAC is its ___, which is a function of the number of binary inputs.
Ans. Resolution

65. Full-scale output of the DAC is achieved when all the data inputs of the DAC are ___.
Ans. High

66. ___ IC is an analog-to-digital converter. Ans. ADC0804

67. LCD stands for ___.
Ans. Liquid Crystal Display

68. To send any of the commands to the LCD, make pin RS =___.
Ans. 0

69. The ___ is the minimum degree of rotation associated with a single step.
Ans. step angle

70. Why driver ULN2003 is used?
Ans. 8051 lacks sufficient current to drive the stepper motor windings, so to energize the stator we must use a driver ULN2003.

71. GPOS stands for ___.
Ans. General Purpose Operating Systems

72. RTOS is the acronym for___.
Ans. Real-Time Operating System

73. ___ are software environments that provide a buffer between the user and the low-level interfaces to the hardware within a system.
Ans. Operating systems

74. The ___ is at the heart of every kernel.
Ans. Scheduler

75. Every time a new task is created, the kernel also creates and maintains an associated Task Control Block (TCB). (True or False?)
Ans. True

States and capitals east of the Mississippi river Quiz

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