GATE EE
Digital Electronics
Microprocessor
Previous Years Questions

Marks 1

In $$8085A$$ microprocessor, the operation performed by the instruction $$LHLD$$ $${2100_H}$$ is
An input device is interfaced with Intel $$8085$$ $$A$$ microprocessor as memory mapped $${\rm I}/O,$$ the address of the device is $$2500H.$$ In orde...
The logic circuit used to generate the active low chip select $$(CS)$$ by an $$8085$$ microprocessor to address a peripheral is shown in Fig. The peri...
When a program is being executed in an $$8085$$ microprocessor, its Program Counter contains
Which one of the following is not a vected interrupt?
In a microprocessor, the address of the next instruction to be executed, is stored in
The range of address for which the memory chip shown in Figure, will be selected is .... to ......... ...
In an $$8085$$ microprocessor, after the execution of $$XRA$$ $$A$$ instruction
The contents of the accumulator in an $$8085$$ microprocessor is altered after the execution of the instruction.
Three devices $$A,$$ $$B$$ and $$C$$ have to be connected to a $$8085$$ microprocessor. Device $$A$$ has highest priority and device $$C$$ has the low...
If the $$HLT$$ instruction of a $$8085$$ microprocessor is executed,

Marks 2

In an $$8085$$ microprocessor, the following program is executed At the end of program, register $$A$$ contains...
An output device is interfaced with $$8$$ bit microprocessor $$8085$$$$A.$$ The interfacing circuit is shown in figure The interfacing circuit makes ...
A portion of the main program to call a subroutine $$SUB$$ in an $$8085$$ environment is given below: $$\eqalign{ & LXI\,\,\,\,\,\,\,\,\,\,\,\,\...
When a $$''CALL$$ $$addr'$$ instruction is executed, the $$CPU$$ carries out the following sequential operations internally. Note: $$(R)$$ means conte...
In $$8085$$ microprocessor, the contents of the Accumulator, after the following instructions are executed will become $$\eqalign{ & XRA\,\,\,A ...
The contents (in Hexadecimal) of some of the memory locations in an $$8085A$$ based system are given below The contents of stack pointer $$(SP),$$ p...
Which one of the following statements regarding the $$INT$$ (interrupt) and the $$BRQ$$ (bus request) pins in a $$CPU$$ is true?
In an $$8085$$ $$A$$ microprocessor based system, it is desired to increment the contents of memory location whose address is available in $$(D,E)$$ r...
The associated figure shows the two types of rotate right instruction $${R_1},\,{R_2}$$ available in a microprocessor where Register is a $$8$$-bit re...
The associated figure shows the two types of rotate right instruction $${R_1},\,{R_2}$$ available in a microprocessor where Register is a $$8$$-bit re...
A software delay subroutine is written as given below: How many times $$DCR$$ $$L$$ instruction will be executed?...
The $$8085$$ assembly language instruction that stores the content of $$H$$ and $$L$$ registers into the memory locations $$2050H$$ and $$2051H,$$ res...
The following program is written for an $$8085$$ microprocessor to add two bytes located at memory addresses $$1FFE$$ and $$1FFF$$ $$\eqalign{ &...
An Intel $$8085$$ processor is executing the program given below. $$\eqalign{ & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,MV...
The stack pointer of a microprocessor is at $$A001H.$$ At the end of execution of following instructions, the value of stack pointer is _____________ ...

Marks 3

In a $$8085$$ microprocessor, the following instructions may result in change of accumulator contents and change in status flags. Choose the correct ...
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