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GATE 2019 :National Champion Test Microprocessor

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Question 1

Call instruction when executed by 8085 microprocessor needs

Question 2

Which of the following is/are true about accumulator of INTEL 8085.
(i) Result of all arithmetic and logical instruction is stored in accumulator.
(ii) One of the operand for arithmetic and logical instruction must be in accumulator.
(iii) To move data from one memory location to another data must pass through accumulator.

Question 3

Which of the following statements is/are correct about INTEL 8085 microprocessor
(i) RST 4.5 has lowest priority among hardware interrupts.
(ii) Program counter contains the next instruction to be executed.
(iii) Instruction register holds the Opcode of the instruction to be executed.
(iv) ADO -AD7 are time multiplexed.

Question 4

Which of the following statements is/are correct about CPl A0 H
(i)Content of accumulator is not affected.
(ii)Only sign parity and auxiliary carry flags are affected.
(iii)Only zero and carry flags are affected.

Question 5

A memory system of 128 K bytes needs to be designed with RAM chips of 2 K bytes each and a decoder circuitry constructed with Description: E:\Gate\Gate-EE-14-Dec\12_Mprocesor_EMT_BL-done_files\image161.png decoder chips with “enable” input. The minimum number of decoder chips required in design are ______________.

Question 6

Consider the following program to be executed in INTEL 8085 states from 3000 H
LXI SP, 4000 H
PUSH H
PUSH D
CALL 3050 H
POP H
HLT
After execution of HLT instruction, the program counter and stack pointer contains respectively

Question 7

Consider the assembly language program given below
(1) MVI A, 8F H
(2) SUI CA H
(3) JC DISPLAY
(4) OUT PORT1
(5) HLT
(6) DISPLAY: XRA A
(7) OUT PORT1
(8) HLT
If the above program is executed in 8085 then data displayed at PORT 1 and content of flag register is respectively.

Question 8

The following set of instructions are executed in INTEL 8085 microprocessor.
LXl B, 0020 H
LOOP DCX B
MOV A, B
ORA C
JNZ LOOP
HLT
The following of times the instruction
ORA C executed is __________.

Question 9

Consider an 8085-microprocessor system and that the following program starts from 0100H.
MVI C, 90H
MOV B, C
MOV A, B
What will be the contents of registers A and B and program counter value after execution of the above program?

Question 10

A read write memory chip has a capacity of 128 kbytes. If the memory chip is having equal number address lines and data lines, then minimum number of data lines are ___________.

Question 11

An 8085 microprocessor executes “STA 1234H” with starting address location 1FFEH (STA copies the contents of the Accumulator to the 16-bit address location). While the instruction is fetched and executed, the sequence of values written at the address pins is

Question 12

In timing and control circuit of 8085, synchronization is required for

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Sep 11ESE & GATE EC