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 : 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 : How many operations are there in the instruction set of 8085 microprocessor?
Last Answer : There are 74 operations in the 8085 microprocessor.
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 : 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 : 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 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 : 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 : 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 : 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 : 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 : 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.
Description : 8096 has ___ general purpose I/O ports, Port 2 includes ______ of the following i) two quasi-bidirectional I/O lines ii) two output lines iii) four input lines iv) open drain outputs a) 4, i, iv b) 6, ii, iii c) 4, i,ii,iii d) 6, i, ii, iv
Last Answer : c) 4, i,ii,iii
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 : Why 8087 is referred to as Coprocessor? i) Because 8087 is used in parallel with main processor in a system, rather than serving as a main processor itself. ii) Because 8087 is used in serial with main processor in a ... math computations. a) i & iii b) ii & iii c) iii only. d) i only.
Last Answer : c) iii only.
Description : Which signal of 8085 microprocessor is used to insert wait states ? (a) Ready (b) ALE (c) HOLD (d) INTR
Last Answer : Which signal of 8085 microprocessor is used to insert wait states ? (a) Ready (b) ALE (c) HOLD (d) INTR
Description : Wait status can be achieved in 8085 microprocessor by : - a) TRAP b) DMA c) HOLD d) INTR
Last Answer : Wait status can be achieved in 8085 microprocessor by : - HOLD
Description : The following conditions of policy must be present for a deadlock to be possible. i) Mutual exclusion ii) Hold and wait iii) No preemption iv) Circular wait A) i, ii and iii only B) ii, iii and iv only C) i, iii and iv only D) All i, ii, iii and iv
Last Answer : D) All i, ii, iii and iv
Description : Consider the following justifications for commonly using the two-level CPU scheduling : I. It is used when memory is too small to hold all the ready processes. II. Because its performance is same as that of the FIFO. III. Because it ... ? (A) I, III and IV (B) I and II (C) III and IV (D) I and III
Last Answer : (D) I and III
Description : Which of the following statements on DRAM are correct? i) Page mode read operation is faster than RAS read. ii) RAS input remains active during column address strobe. iii) The row and column addresses are strobed into the ... RAS and CAS inputs respectively. a) i & iii b) i & ii c) all d) iii
Last Answer : d) iii
Description : Explain the signals HOLD, READY and SID
Last Answer : HOLD indicates that a peripheral such as DMA controller is requesting the use of address bus, data bus and control bus. READY is used to delay the microprocessor ... slow responding peripheral is ready to send or accept data. SID is used to accept serial data bit by bit
Description : Which bit of TMOD will exactly configure timer / counter as a timer or counter. i) TMOD.6 of C/T for timer 1 ii) TMOD.6 of C/T for timer 0 iii) TMOD.2 of C/T for timer 0 iv) TMOD.2 of C/T for timer 1 a) i, ii b) ii, iv c) i, iii d) iii, iv
Last Answer : a) i, ii
Description : Which of the following is not a program linking directive i) EXTRN ii) SEGMENT iii) NAME iv) PUBLIC v) USING a) iv, v b) ii, iii c) i, iii d) ii, v
Last Answer : c) i, iii
Description : Which of the following is of type memory initialized Directive? i) DS ii) SET iii) DW iv) DBIT a) i, iii b) ii c) iii d) iv, ii
Last Answer : b) ii
Description : Which of the following instruction is of logical instructions? i) CPL A ii) JC rel iii) DA A iv) ANL A, Rn v) RR A vi) CPL bit a) i, v b) v, iii, I c) iv, ii d) v, iii, ii
Last Answer : c) iv, i
Description : Which of the following is of bit operations? i) SP ii) P2 iii) TMOD iv) SBUF v) IP a) ii, v only b) ii, iv, v only c) i, v only d) iii, ii only
Last Answer : c) i, v only
Last Answer : a) ii, v only
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 : 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 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.