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 : Which of the following instructions is not available in 8085 microprocessor? (A) LDA 3850 (B) XTHL (C) push PSW (D) LDAXH
Last Answer : Which of the following instructions is not available in 8085 microprocessor? (A) LDA 3850 (B) XTHL (C) push PSW (D) LDAXH
Description : Mention the categories of instruction and give two examples for each category
Last Answer : The instructions of 8085 can be categorized into the following five • Data transfer MOV Rd,Rs STA 16-bit • Arithmetic ADD R DCR M • Logical XRI 8-bit RAR • Branching JNZ CALL 16-bit • Machine control HLT NOP
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 : List any four salient features of 8085 microprocessor
Last Answer : Features of 8085: 1. 16 address line so 216=64 Kbytes of memory can be addressed. 2. Operating clock frequency is 3MHz and minimum clock frequency is 500 KHz. 3. On chip bus controller ... duty cycle TTL clock 10. Provide 2 serial I/O lines, so peripheral can be interfaced with 8085 μp
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 : 8253, 8257 c) 8257,8251 d)8251,825721.Consider the following set of 8085 instruction.MVI A,82HORA AJP DSPLYXRA ADSPLY:OUT PORT1HLT.The output at PORT1 isa) 00H b) FFH c) 92H d) 11H
Last Answer : a) 00H
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 : How many operations are there in the instruction set of 8085 microprocessor?
Last Answer : There are 74 operations in the 8085 microprocessor.
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 : 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 : 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 : 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 : .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 : 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 : 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 : 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.
Description : In 8085 name the 16 bit registers? a) Stack pointer b) Program counter c) a & b
Last Answer : c) a & b
Description : Explain Briefly The Flag Register In The 8085 Microprocessor.?
Last Answer : Answer :The flag register in 8085 is an 8-bit register which contains 5 bit positions. These five flags are of 1bit F/F and are known as zero, sign, carry, parity and auxiliary carry. ... addition and subtraction operations. The parity flag is used for results containing an even number of one's.
Description : Mention The Various Functional Blocks Of The 8085 Microprocessor.?
Last Answer : Answer :The various functional blocks of the 8085 microprocessor are: Registers Arithmetic logic unit Address buffer Increment / decrement address latch Interrupt control Serial I/O control Timing and control circuitry Instructions decoder and machine cycle encoder.
Description : How Can Signals Be Classified For The 8085 Microprocessor?
Last Answer : Answer :The signals of the 8085 microprocessor based on their functions can be classified into 7 categories namely: Frequency and power signals Address and data buses The control bus Interrupt Signals Serial Input / Output signals DMA signals Reset Signals
Description : Enlist the features of 8085 microprocessor.
Last Answer : Features of 8085 microprocessor: 1. 16 address line so 216=64 Kbytes of memory can be addressed. 2. Operating clock frequency is 3MHz and minimum clock frequency is 500 KHz. 3. On chip bus ... cycle TTL clock 10. Provide 2 serial I/O lines, so peripheral can be interfaced with 8085 μp
Description : Describe the functions of stack pointer and program counter of 8085.
Last Answer : Stack pointer: 1. It is a 16 bit register which is used to store the address of topmost filled memory location of stack memory. 2. SP always points current top of stack. 3. If data is ... of memory and in 8085 the address of memory is 16 bit. Hence program counter is 16 bit register.
Description : State the functions of following pins of 8085 1) SOD 2) HLDA
Last Answer : 1) SOD: Serial Output data SOD pin is used to transmit data serially from accumulator to the external devices connected to the pin. 2) HLDA: Microprocessor generates HLDA signal to acknowledge requesting device after HOLD signal.
Description : State the functions of temporary registers of 8085 microprocessor.
Last Answer : Temp Register (8 bits) is also called as operand register as it is used by μp for storing one of the operands during an operation and also for storing the result of any execution temproary.
Description : The 8085 Microprocessor has A) 8-bits Data bus and 16-bits Address bus B) 8-bits Data bus and 8-bits Address bus C) 16-bits Data bus and 16-bits Address bus D) 32-bits Data bus and 8-bits Address bus
Last Answer : B) 8-bits Data bus and 8-bits Address bus.
Description : The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully? A) 5.6 µs B) 5.7 µs C) 5.8 µs D) 5.9 µs
Last Answer : The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully? A) 5.6 µs B) 5.7 µs C) 5.8 µs D) 5.9 µs
Description : In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require (i.e., when HOLD and WAIT signals are NOT forced)? A) 4 to 6 B) 3 to 8 C) 2 to 3 D) 8 to 12
Last Answer : In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require (i.e., when HOLD and WAIT signals are NOT forced)? A) 4 to 6 B) 3 to 8 C) 2 to 3 D) 8 to 12
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 : What is the size of memory which can be accessed by direct accessing in 8085 microprocessor? A) 64 kB B) 4 kB C) 128 kB D) 128 MB
Last Answer : What is the size of memory which can be accessed by direct accessing in 8085 microprocessor? A) 64 kB B) 4 kB C) 128 kB D) 128 MB
Description : What is the size of SP register in 8085 microprocessor? A) 16 bits B) 8 bits C) 64 bits D) 48 bits
Last Answer : What is the size of SP register in 8085 microprocessor? A) 16 bits B) 8 bits C) 64 bits D) 48 bits
Description : The ALE line of an 8085 microprocessor is used to (A) latch the output of an I/O instruction into an external latch. (B) deactivate the chip-select signal from memory devices. (C) find the interrupt ... of the TRAP interrupt. (D) latch the 8 bits of address lines AD7-AD0 into an external latch.
Last Answer : The ALE line of an 8085 microprocessor is used to latch the 8 bits of address lines AD7-AD0 into an external latch.