Explain the purpose of the I/O instructions IN and OUT

2 years ago
Microprocessors

The IN instruction is used to move data from an I/O port into the accumulator.

The OUT instruction is used to move data from the accumulator to an I/Oport.

The IN and OUT instructions are used only on microprocessor, which usea separate address space for interfacing.

0
Rusma Khadka
Rusma Khadka
Sep 9, 2022
More related questions

1. PAC`KED TO UNPACKED

2. PACKED TO ASCII

3. SHR

4. SHL

5. SAR

6. ROR

7. ROL

8. RCR

9. RCL

10. Logical XOR operation

11. Logical NOT operation

12. Logical OR operation

13. Logical AND operation

14. ASCII Divisions

15. ASCII Multiplication

16. ASCII Subtraction

17. ASCII Addition ARTHMETICAL OPERATIONS

18. Multi byte Subtraction

19. Multi byte Addition

20. 16-Bit Division

21. 16-Bit Multiplication

22. 16-Bit Subtraction

23. 16-Bit Addition

24. 8-Bit Addition

25. Write a program for the addition of two 8 – bit numbers.

26. Explain the operating mode 2 of 8051 serial ports?

27. Explain the operating mode0 of 8051 serial ports?

28. Write a program to subtract the contents of R1 of bank0 from the contents of R0 of bank2 using 8051?

29. Write a program to subtract two8-bit numbers & exchange the digits using 8051?

30. Write a program to swap two numbers using8051?

31. Write a program to add two8-bit numbers using8051?

32. Write a program to find 2’s complement using 8051?

33. Write a program to load accumulator DPH&DPL using 8051?

34. Write about the jump statement?

35. Write about CALL statement in 8051?

36. Write a program to mask the 0th&7th bit using 8051?

37. Write a program to perform multiplication of 2 Nos using 8051?

38. Write a program to load accumulator a, DPH and DPL with 30H?

39. Explain the content of the accumulator after the execution of the following program segments?

40. Write a program using 8051 assembly language to change the data 55h stored in the lower byte of the data pointer register to AAH using rotate instruction?

41. What is an USART?

42. What is the size of ports in 8255?

43. What is the purpose of control word written to control register in 8255?

44. What is a control word?

45. List the operation modes of 8255?

46. What is the use of modem control unit in 8251?

47. What are the modes used in keyboard modes?

48. Define scan counter?

49. Give the different types of command words used in 8259A

50. What are the modes of operation used in 8253?[

51. What are the features used mode1 in 8255?

52. What is synchronous data transfer?

53. What is the various programmed data transfer method?

54. What is the use of 8051 chip?

55. What are the modes of operation used in 8253?

56. List the addressing modes of 8051?

57. List the features of 8051 microcontroller?

58. Write a program to subtract the contents of RI of Bank0 from the contents of R00f Bank2.

59. Name the five interrupt sources of 8051?

60. Compare Microprocessor and Microcontroller.

61. Explain the register IE format of 8051

62. Name the special functions registers available in 8051

63. Give the memory size of 8051 microcontroller

64. What are the applications of microcontroller

65. Specify the single instruction, which clears the most significant bit of Bregister of 8051,without affecting the remaining bits.

66. Give the alternate functions for the port pins of port3?

67. 3. State the function of RS1 and RS0 bits in the flag register of Intel8051microcontroller?

68. Explain DJNZ instruction of Intel8051 microcontroller ?[

69. What is mean by microcontroller

70. What are subroutine?

71. Compare CALL and PUSH instructions

72. Why do we use XRAA instruction?

73. Define stack and stack related instructions?

74. What is the use of addressing modes, mention the different types?[

75. Explain the different instruction format set

76. Explain LDA, STAANDDAA instructions

77. Mention the categories of machine control group of instruction

78. List the four instructions which control the interrupt structure of the 8085 microprocessor?

79. What is the difference between the shift and rotate instructions?

80. Explain the use of branch instruction and give example.

81. List out the five categories of the 8085 instructions.Give e.g. of the instructions for each group?

82. How many operations are there in the instruction set of 8085 microprocessor?

83. What is an instruction?

84. How many machine cycles does 8085 have, mention them?

85. Define instruction cycle, machine cycle and T-state?

86. Steps involved to fetch a byte in 8085?

87. What are the basic units of a microprocessor ?

88. What are machine language and assembly language programs?

89. Why address bus is unidirectional?

90. Why interfacing is needed for 1/0 devices?

91. What is the important control signal in 8085 microprocessor

92. Define the function of parity flag and zero flag n 8085

93. What is stack and what is the function of stack pointer[Dec 07]

94. List the five interrupt pins available in 8085[may 2010]

95. What is tristate logic?[june 2009]

96. What is the need of ALE signal in 8085 microprocessor?

97. Specify the size of data, address, memory word and capacity of 8085 microprocessor

98. List the control and status signal of 8085 microprocessor and mention its need?

99. What is the function of program counter in 8085 microprocessor?

100. What is difference between microprocessor and microcontroller?

101. What is Microprocessor logic?

102. When mvi is used in microprocessor?

103. When was the first microprocessor introduced?

104. How many pins in 8086 microprocessor have?

105. What is dual core microprocessor?

106. What is the function of LOADA mem and LOADB mem?

107. 26) What is clock speed in microprocessor?

108. What is buffer in microprocessor?

109. What is ale in microprocessor?

110. What is adc in microprocessor?

111. What is embedded microprocessor?

112. What is mnemonics in microprocessor?

113. What is memory mapping in microprocessor?

114. What is data bus in microprocessor?

115. What is assembler in microprocessor?

116. What is 8 bit microprocessor?

117. What is 16 bit microprocessor?

118. What is macro in microprocessor?

119. What is opcode and operand in microprocessor?

120. What is pipelining in microprocessor?

121. What is subroutine in microprocessor?

122. What is interfacing in microprocessor 8086

123. What is polling in microprocessor?

124. What is stack in microprocesso

125. What is register in microprocessor?

126. What is interfacing in microprocessor?

127. What is flag in microprocessor?

128. What is bus in microprocessor?

129. What is 8086 microprocessor?

130. What is interrupt in microprocessor?

131. What is microprocessor 8085?

132. What is microprocessor?

Questions Bank

View all Questions