2021-08-16 13:39:30
1. The size of physical address in 8086 microprocessor is.
Ans. 20 bit
2. ‘SIM stands for ......and is instruction
Ans. Set Interrupt mask, 1 byte
3. Microprocessor consists of.
Ans. All
4. Which of the following is not the function of BIU (Bus Interface Unit) in 8086 microprocessor:
Ans. reads data from port and memory
5. This programming technique using 8085 is instructed to execute certain set of instructions repeatedly to perform a
particular task number of times
Ans. Indexing
6. For which addressing mode, 8085 executes its instructions without the necessity of a reference to the memory for
operands?
Ans. Register Indirect
7. assembler directive specifies that the next block of instructions should be stored from 2000H
And. ORG 2000H
8. The temporary registers in 8085 microprocessor that are not accessible to the user
And. W and Z
9. ‘Which instruction is required to rotate the content of accumulator one bit left along with carry?
Ans. RAL
10. Machine cycle is defined as
Ans. |s the time required to complete one operation of accessing memory or I/O
11. is an input signal to the processor indicating the immediate suspension of all microprocessor’
activities?
And. Hold
12. The following instruction of 8086 microprocessor.
Ans. XCHG
13. CALL 2040H is instruction
Ans. 3 byte
14. Which device accepts data characters from the CPU in parallel format and then converts them into serial data
stream for transmission and simultaneously, it can receive serial data streams and convert them into parallel data
characters for the CPU?
Ans. 8255
15. Direction flag in 8086 microprocessor is used with
Ans. String Instructions
16. In which mode of 8254 timer/counter, If the count value N is 9 then the output will be alternatively high 5 clock
Periods and low for 4 clock periods:
Ans. Mode 2
17. What is the size of Flag register in 8086 microprocessor?
Ans. 16-bit
18. How many ports 8255A has
Ans. 3
19. When a peripheral device is connected with microprocessor in Input/Output Mode, the data transfer takes place
Ans. From Accumulator to I/O device
20. is the interface that a computer uses to talk to and exchange data with a modem and other serial
devices.
Ans. RS 232C
21. The maximum size of memory that can be addressed by the 8085 microprocessor
Ans. 64kb
22. How many pins are in 8085 microprocessor
Ans. 40 pins
23. What can be the maximum size of a segment in 8086 memory?
Ans. 64 kilobytes
24. Trap interrupt is:
Ans. Non Maskable and vectored
25. Multi-core processor system has
Ans. ACPU with multiple independent processing units
26. The total number of modes 8253 can work
Ans. 6
27. In which of the following used to store the critical pieces of data during subroutine and interrupt processing
Ans. Stack
28. If T is the clock period of the system, f denotes the clock frequency of the system and n denotes the number of T-
states required by an instruction to get executed, then the total time to execute an instruction will be indicated by
Ans. T+n
29. Which of the following statements is not true
Ans. Fourth generation microprocessor were 16-bit microprocessors
30. ‘The D-bit in the instruction format of 8086 microprocessor specifies that:
Ans. The register is source register or destination register
30 answers done
1.4K views10:39
A
