Description : Interfacing devices for DMA controller, programmable interval timer are respectively…a) 8257, 8253 b) 8253, 8257 c) 8257,8251 d)8251,825721.
Last Answer : a) 8257, 8253
Description : What will be the output at PORT1 if the following program is executed? MVI B, 82H MOV A, B MOV C, A MVI D, 37H OUT PORT1 HLT (A) 37H (B) 82H (C) B9H (D) 00H
Last Answer : Answer: B Explanation: In 8085 programming, the result of an operation is stored in the accumulator. So output is 82H.
Description : What is the address range of SFR Register bank? a) 00H-77H b) 40H-80H c) 80H-7FH d) 80H-FFH
Last Answer : c) 80H-7FH
Last Answer : d) 80H-FFH
Description : The content of the accumulator after the execution of the following 8085 assembly language program, is MVI A, 35H MOV B, A STC CMC RAR XRA B (A) 00H (B) 35H (C) EFH (D) 2FH
Last Answer : (D) 2FH
Description : .In an 8085 based system, the maximum number of input output devices can be connectedusing I/0 mapped I/O method isa) 64 b) 512 c) 256 d) 65536
Last Answer : b) 512
Description : ISA stands for: a. Instruct set area b. Instruction set architecture c. Both a and b d. None of these
Last Answer : b. Instruction set architecture
Description : How many operations are there in the instruction set of 8085 microprocessor?
Last Answer : There are 74 operations in the 8085 microprocessor.
Description : In an 8085 microprocessor, the instruction CMP B has been executed while the contentsof accumulator is less than that of register B. As a result carry flag and zero flag will berespectively (A) set, reset (B) reset, set (C) reset, reset (D) set, set
Last Answer : (A) set, reset
Description : The contents of accumulator before CMA instruction is A5H. Its content after instructionexecution isa) A5H b) 5AH
Last Answer : b) 5AH
Description : 8086 microprocessor is interfaced to 8253 a programmable interval timer. The maximum number by which the clock frequency on one of the timers is divided by a) 216 b) 28 c) 210 d) 220
Last Answer : d) 220
Description : How many speed of 8088,8085,8086 microprocessor: a. 2.5 Million instruction per second b. 1.5 Million instruction per second c. 3.5 Million instruction per second d. 1.6 Million instruction per second
Last Answer : a. 2.5 Million instruction per second
Description : Then number of T-states of the instruction STA in 8085 microprocessor is A) 10 B) 12 C) 13 D) 16
Last Answer : Then number of T-states of the instruction STA in 8085 microprocessor is 13
Description : The content of the accumulator after the execution of the following 8085 assembly language program, is: MVI A, 42H MVI B, 05H UGC: ADD B DCR B JNZ UGC ADI 25H HLT (A) 82 H (B) 78 H (C) 76 H (D) 47 H
Last Answer : (C) 76 H
Description : CISC stands for: a. Complex instruction set computer b. Camper instruct set of computer c. Compared instruction set computer d. None of these
Last Answer : a. Complex instruction set computer
Description : RISC stands for: a. Reduced Instruction set computer b. Reduced Instruct set compare c. Reduced instruction stands computer d. All of these 107. DEC stands for:
Last Answer : a. Reduced Instruction set computer
Description : RISC stands for: a. Reduced Instruction Set Computer b. Reduced Intergraded Set Computer c. Resource Instruction Set Computer d. Resource Instruction System Computer
Last Answer : a. Reduced Instruction Set Computer
Description : CISC stands for: a. Complex Instruction System Computer b. Complex Instruction Set Car c. Complex Instruction Set Computer d. None of these
Last Answer : c. Complex Instruction Set Computer
Description : Virtual Mode Flag bit can be set using ____ instruction or any task switch operation only in the _____ mode a) IRET, Virtual b) POPF, Real c) IRET, protected d) POPF, protected
Last Answer : b) POPF, Real
Description : Which of the following instruction is used to set bit port directly? a) SET P1.0 b) MOV P1.0, bit c) SETB P1.0 d) JB P1.0, bit
Last Answer : JB P1.0, bit
Description : In data transfer manipulation designing as instruction set for a system isa complex_ a. Art b. System Cc. Computer d. None of these
Last Answer : a. Art
Description : The status that cannot be operated by direct instructions isa) Cy b) Z c) P d) AC
Last Answer : d) AC
Description : List out the five categories of the 8085 instructions. Give examples of the instructions for each group.
Last Answer : • Data transfer group – MOV, MVI, LXI. • Arithmetic group – ADD, SUB, INR. • Logical group –ANA, XRA, CMP. • Branch group – JMP, JNZ, CALL. • Stack I/O and Machine control group – PUSH, POP, IN, HLT.
Description : How many machine cycles does 8085 have, mention them
Last Answer : The 8085 have seven machine cycles. They are • Opcode fetch • Memory read • Memory write • I/O read • I/O write • Interrupt acknowledge • Bus idle
Description : How many interrupts does 8085 have, mention them
Last Answer : The 8085 has 5 interrupt signals; they are INTR, RST7.5, RST6.5, RST5.5 and TRAP
Description : Steps involved to fetch a byte in 8085
Last Answer : i. The PC places the 16-bit memory address on the address bus ii. The control unit sends the control signal RD to enable the memory chip iii. The byte from ... byte is placed in the instruction decoder of the microprocessor and the task is carried out according to the instruction
Description : What are operations performed on data in 8085
Last Answer : The various operations performed are • Store 8-bit data • Perform arithmetic and logical operations • Test for conditions • Sequence the execution of instructions • Store data temporarily during execution in the defined R/W memory locations called the stack
Description : What is the signal classification of 8085
Last Answer : All the signals of 8085 can be classified into 6 groups • Address bus • Data bus • Control and status signals • Power supply and frequency signals • Externally initiated signals • Serial I/O ports
Description : Explain priority interrupts of 8085.
Last Answer : The 8085 microprocessor has five interrupt inputs. They are TRAP, RST 7.5, RST 6.5, RST 5.5, and INTR. These interrupts have a fixed priority of interrupt service. If two or more interrupts go ... 8085 is shown in the table. Interrupts Priority TRAP RST 7.5 RST 6.5 RST 5.5 INTR
Description : List the four instructions which control the interrupt structure of the 8085 microprocessor.
Last Answer : • DI ( Disable Interrupts ) • EI ( Enable Interrupts ) • RIM ( Read Interrupt Masks ) • SIM ( Set Interrupt Masks )
Description : What is the function of IO/M signal in the 8085?
Last Answer : It is a status signal. It is used to differentiate between memory locations and I/O operations. When this signal is low (IO/M = 0) it denotes the memory related operations. When this signal is high (IO/M = 1) it denotes an I/O operation.
Description : List the allowed register pairs of 8085.
Last Answer : • B-C register pair • D-E register pair • H-L register pair
Description : List the 16 – bit registers of 8085 microprocessor.
Last Answer : Stack pointer (SP) and Program counter (PC).
Description : What is Microprocessor? Give the power supply & clock frequency of 8085
Last Answer : A microprocessor is a multipurpose, programmable logic device that reads binary instructions from a storage device called memory accepts binary data as input and processes data according ... provides result as output. The power supply of 8085 is +5V and clock frequency in 3MHz.
Description : What type of architecture is used in 8085 microprocessor?
Last Answer : Ans- INTEL 8085 is a 8-bit microprocessor. It's based on Von-Neumann architecture in which the data and instructions are in the same memory space without any distinction between them. Data line: 8-bits--Can ... of data at a time. Address line: 16-bits--Can address upto 2^16(64KB) of address space.
Description : What is function of ALE in 8085 microprocessor?
Last Answer : Ans-AlE stands for the address latch enableit 's working is that it differentiate the address and data bus in microprocessor.when it is high it select address bus .when it is low it select data bus.
Description : Which is 16 Bit microprocessor: a. 8088 b. 8086 c. 8085 d. All of these
Last Answer : d. All of these
Description : Which is the main feature of 8085: a. Internal clock generator b. Internal system controller c. Higher clock frequency d. All of these
Description : In 1977 which corporation introduced an updated version of the 8080- the 8085: a. Motorola b. Intel c. Rockwell d. National
Last Answer : b. Intel
Description : Which year Intel corporation introduced an updated version of the 8080- the 8085: a. 1965 b. 1976 c. 1977 d. 1985
Last Answer : c. 1977
Description : Intel used HMOS technology to recreate_____: a. 8084 A b. 8086 A c. 8085 A d. 8088 A
Last Answer : c. 8085 A
Description : Which are some of popular processor: a. Motorola 6800 and 6809 b. Intel 8085 c. Zilog Z80 d. All the above
Last Answer : d. All the above
Description : The___ was very successful in the calculator market at that time: a. Motorola 6800 and 6809 b. Microprocessor 4004 c. Intel 8085 d. None of these
Last Answer : b. Microprocessor 4004
Description : Microprocessor 8085 can address location upto a. 32K b. 128K c. 64K d. 1M
Last Answer : c. 64K
Description : The number of software interrupts in 8085 is ____ a) 5 b) 8
Last Answer : b) 8
Description : To put the 8085 microprocessor in the wait state(i) lower the-HOLD input (ii) lower the READY input (iii) raise the HOLD input(iv) raise the READY input
Last Answer : (ii) lower the READY input
Description : Accumulator based microprocessor example are: a. Intel 8085 b. Motorola 6809 c. A and B d. None of these
Last Answer : c. A and B
Description : Why 8085 processor is called an 8 bit processor? a) Because 8085 processor has 8 bit ALU. b) Because 8085 processor has 8 bit data bus. c) a & b.
Last Answer : a) Because 8085 processor has 8 bit ALU.
Description : Which stack is used in 8085? a) FIFO b) LIFO c) FILO
Last Answer : b) LIFO
Description : Which interrupt is not level sensitive in 8085? a) RST6.5 is a raising edge-trigging interrupt. b) RST7.5 is a raising edge-trigging interrupt. c) a & b.
Last Answer : b) RST7.5 is a raising edge-trigging interrupt.