What is the total external data memory that can be interfaced to the 8051?
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ECE · all questionsMicroprocessors And Microcontrollers
Microprocessors And Microcontrollers
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Considering figure 1, if SI = 1000H, the content of register AH after the instruction MOV AH, [SI] of 8086 µp will be
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In a computer, set of electrical paths which is used to transfer data is called
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Address bus of 8086 contains
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An 8-bit microprocessor has the typical two way connected buffered lines which are called:
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Consider the following statements:
The 8259A Programmable Interrupt Controller can
1. manage eight interrupts
2. vector an interrupt request anywhere in the memory map
3. have 8-bit or 16-bit interval between interrupt vector locations
4. be initialized with operational command words
Which of the above statements are correct?
The 8259A Programmable Interrupt Controller can
1. manage eight interrupts
2. vector an interrupt request anywhere in the memory map
3. have 8-bit or 16-bit interval between interrupt vector locations
4. be initialized with operational command words
Which of the above statements are correct?
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A controller that takes control of the buses and transfers data directly between source and destination bypassing the microprocessor is known as
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In a 8051 microcontroller, PCON register controls the baud rate in:
1. Synchronous transmission
2. Asynchronous transmission
1. Synchronous transmission
2. Asynchronous transmission
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In 8051 family instructions, which one of the following option is true?
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If the operating frequency of an 8086 microprocessor is 10 MHz and, if for the given instruction, the machine cycle consists of 4 T-states, what will be the time taken by the machine cycle to complete the execution of that machine cycle to complete the execution of that same instruction when three wait states are inserted?
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A stake machine pushes operands on a stack and evaluates binary operators by a pcs (i.e pop/compute/store) where the top two operands are popped computation is performed and the result is pushed onto stack. Evaluation of an expression (x*y)+ (u*v) by Reverse Polish notation in a stack machine needs
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The first machine cycle of an instruction is always
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A CDMA system requires of 10 dB. Each of the transmitters in the network transmits data at the rate of 1 Kbps with a PN chip rate of 1 Mbps. The maximum number of such users that the network can support is:
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If instruction RST 5 is written in a program the problem will jump to location
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In case the code is position dependent, the most suitable addressing mode is
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The number of pins in microprocessor 8086 is
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Which one of the following pairs of 8086 microprocessor's interrupt is not correctly matched?
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Which instruction of 8051 microcontroller is used for reading data from code memory?
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The following instructions have been executed by an 8085 microprocessor
From which address will the next instruction be fetched?
| ADDRESS (HEX) | INSTRUCTION |
| 6010 | LXI H, 8A79H |
| 6013 | MOV A, L |
| 6014 | ADD H |
| 6015 | DAA |
| 6016 | MOV H, A |
| 6017 | PCHL |
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Which of the following interrupts is unmaskable interrupts
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