1) The 8085 has the following 5 different types. 224) Albania, (+ By using our site, you Maldives, (+ Afghanistan, (+ Bahrain, (+ Georgia, (+ 380) A machine cycle consists of the steps that a computer's processor executes whenever it receives a machine language instruction. ALE Provides signal for multiplexed address and data bus. 233) (These questions are NPTEL assignment questions on 8085). Memory Read (MR) 3. The consent submitted will only be used for data processing originating from this website. 995) 977) 977) 64) These four CPU operations includes Fetch , Decode , Execute and Store. 64) According to this instruction set reference, a conditional branch on the 8085 takes 9 T-states (2 M-cycles) if the branch isn't taken, and 18 T-states (5 M-cycles) if the branch is taken. The 8085 uses the first 3 T-states to fetch the opcode. In this post, we present 15 MCQs with answers on the 8085 Instruction set, addressing modes, and Machine cycles. 34) 91) India, (+ If the carry bit was set when the instruction began, or if 0x06 was added to the accumulator in the first step, 0x60 is . 358) Finland, (+ The latency of the branch depends on which direction it goes. 234) Cambodia, (+ South Africa, (+ 348) This instruction supports immediate addressing mode for specifying the data in the instruction. Swaziland, (+ 27) Hungary, (+ 91) It is the most basic CPU operation, and modern CPUs are able to perform millions of machine cycles per second. An example of data being processed may be a unique identifier stored in a cookie. The first Machine Cycle of 8085 Microprocessor of every instruction is opcode fetch cycle in which the 8085 finds the nature of the instruction to be executed. Fetch - Retrieve an instruction from the memory. 4. We make use of First and third party cookies to improve our user experience. (These questions are NPTEL assignment questions on 8085). Maldives, (+ 7 How many clock cycles does an instruction take to execute? Russia, (+ MVI A,56h CMA STC MVI B,0FH ANA B ANI 1 ORA B ORI 80h XRA B XRA A XRI 32h STC RST1 . 20.Machine cycles in "CALL" instruction of 8085 CPU are a.6 b.5 c.4 d.3 answer: (b) 21.how many hardware interrupt requests a single interrupt controller IC8259A can process? 351) To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Sweden, (+ Pakistan, (+ START: MVI B, 4FH MVI C, 78H MOV A, C OUT 07H CALL DEL MVI A, 8FH MVI B, 68H SUB B ANI 0FH STA 2070H CALL DEL AGAIN: IN F2H CMA ORA A JZ AGAIN DEL: LXI D, 00FFH REP: DCX D MOV A, E ORA D JNZ REP RET ii) State the address of the following in the hand assembled program (2mks) I) DEL label II) STA instruction 230) Saudi Arabia, (+ 3. United Arab Emirates, (+ Guinea, (+ TRAP The steps performed by the computer processor for each machine language instruction received. Hence these are known as memory read or I/O read machine cycles. Turkey, (+ Very Long Instruction Word (VLIW) Architecture, Instruction execution and straight line sequencing in CO, Nano programming in Micro Instruction Format, Complete Interview Preparation- Self Paced Course, Data Structures & Algorithms- Self Paced Course. The control & status signals are set as follows: IO/M=0, s0 =1 and s1 =1. Maldives, (+ This machine cycle has four T-states. D. One to fetch and decode the instruction (4 T states), and two more machine cycles (that is, 2*3 = 6 T states) to read two bytes from the stack (stack is exterior to microprocessor, stack is in read-write memory, so to exchange data with stack needs machine cycles). For example: 2000: MOV B, C. Only opcode fetching is required for this instruction and thus we need 4 T states for the timing diagram. Cambodia, (+ The instruction cycle is the time taken by the processor to complete the execution of an instruction.An instruction cycle consists of one to six machine cycles. It requires 4T states. New Zealand, (+ 971) Tajikistan, (+ Reciprocal throughput: The average number of core clock cycles per instruction for a series of independent instructions of the same kind in the same thread. Expain the RIM and SIM instruction. Afghanistan, (+ Mauritius, (+ 49) 358) Continue with Recommended Cookies. 05 Jun 2020 11:50 AM. Using tristate buffer, more than one device can transmit information over the data bus by enabling only one device at a time. 973) A machine cycle (CPU cycle) is the time the processor takes to execute one machine language command. Netherlands, (+ Mexico, (+ Q18. General Syntax - MVI reg_name, value (Hexadecimal). France, (+ South Korea, (+ MVI B,00H LXI H,XX75H MOV M,B INX H MOV M,B HLT. 995) 5 . OUT operation means Output data from Accumulator to a port with 8 bit address.The contents of the accumulator are copied into the output port.It is a two byte operation with 3 machine cycles and 10 T states.10T states 4 for Opcode fetch, 3 for Memory read and 3 for I/O write operation. 1. 2) The content of the accumulator after the execution of the following instruction will be, 3 ) Match List-I and List-II and select the correct answers, 4 ) In the 8085 microprocessor, the address for TRAP input is. Zimbabwe, English Special Course for SSC CGL, CPO, GD, SSC CGL, CPO, CHSL, GD Comprehensive Course. 45) It consists of 4 machine cycles. 380) 52) Egypt, (+ 41) Tajikistan, (+ We make use of First and third party cookies to improve our user experience. Assume the memory address of the opcode and the data. The result of this ANDingoperation will be stored in the Accumulator itself over writing its previous content. One instruction will contain 1 to 5 machine cycles. United States, (+ correct answer: b. RST 6.5 4. Afghanistan, (+ 230) Russia, (+ 44) United Kingdom, (+ MVI is a mnemonic, which actually means "Move Immediate". This instruction uses immediate addressing for specifying the data. Pakistan, (+ Examples of M-cycles are "Opcode Fetch . 31) Saudi Arabia, (+ A T-state equals one clock cycle on the 8085 as far as I know. 2 The machine code for the JMP instruction comprises of: opcode - 11CCC010 (where CCC is the state of the flag bit used to set the condition) 8 bits and address for the jump - let's say a 16 bit address. Only in t1 it used as address bus to fetch lower bit of address otherwise it will be used as data bus. France, (+ A. 00 lower bit of address where opcode is stored. Machine Cycle is the time required to complete one operation-accessing either the memory or an I/O device. 968) 82) 855) In 8085 Instruction set, ANI is a mnemonic, which stands for "ANd Immediate with Accumulator" and "d8" stands for any 8-bit or 1-Bytedata. Mexico, (+ You should be summing the latency of every instruction that executes, and most instructions in the listing will execute more than once. Opcode Fetch (OF) 2. 880) It includes the timing diagram of opcode fetch and memory read machine cycle.Timing diagra. 82) Finland, (+ 5. Albania, (+ Cambodia, (+ -The method of specifying the data to be operated by the instruction is called Addressing. 46) 358) Interrupt Acknowledge (IA) 7. 995) Second machine cycle M2:-In the second machine cycle the memory is read. _____ is Low level language a) machine language b) assembly language c) c d) a and b. correct answer; d. machine language and assembly language are machine Sweden, (+ 348) Calculate the execution time required for executing the instructions with the system frequency of 3 MHz. A microprocessor using a 3 MHz clock has three T states in each machine cy. Usually, it consists of four T states. REVIEW QUESTIONS 1. B. 93) '45' data will be stored in the B register. With this instruction,we can load a register with an 8-bitsor 1-Bytevalue. Ukraine, (+ Q17. Swaziland, (+ 966) 355) Define (a) Instruction cycle, (b) Machine cycle, (c) Clock cycle. : . 20) Zimbabwe, (+ T-states are one clock period long, and the instruction length is measured in T-states. The status of S0 and S1 pins for memory . Georgia, (+ MCQs on 8085 Instruction set, Addressing Modes & Machine cycles | NPTEL assignment Q&A, Atomic Structure shell model, based on the Bohr model, Neutralization reaction definition, examples, equations. Manage Settings Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Under the control of the control unit, instructions are processed in a step-by-step fashion. Denmark, (+ South Africa, (+ In this instruction 8-bit data value in register r2 will be moved to the 8-bit register r1. Example: MVI B, 05H Opcode: MVI Operand: B is the destination register and 05 is the source data which needs to be transferred to the register. Q16. MVI A, 33H MVI B, 78H ADD B CMA . Read more here. South Korea, (+ Russia, (+ required 8-bit data, and put the results again in the accumulator. 7) South Korea, (+ MVI Instruction Timing Diagram Opcode Fetch Cycle Memory Read Cycle Frequency. 268) Denmark, (+ United Kingdom, (+ 973) 46) The RET instruction needs 3 machine cycles. Guinea, (+ Machine Cycle: Time taken to execute one OPERATION is known as a machine cycle. Portugal, (+ Sweden, (+ 1. 348) Spain, (+ 233) Q19. 20) 91) 966) It occupies 2-Bytes in memory. Saudi Arabia, (+ Ukraine, (+ Q 1: Identify the memory locations that are cleared by the following instructions. So after execution of the instruction the updated values will be, Let us check the timing diagram of this instruction MVI M, ABH. Explain stack and stack pointer. Bahrain, (+ 32) If the carry bit is set or if the value of bits 0-3 exceed 9, 0x06 is added to the accumulator. User Agreement,Privacy Policy E. G. - MVI A, 23H; This above code means that 23H (user input) will be stored in the Accumulator. I/O Read (IOR) 5. Opcode fetch machine cycle The opcode fetch machine cycle (OFMC) involves the fetching of the opcode of the instruction to be executed and the decoding process of that opcode. 971) 90) 4. Poland, (+ 1. . A simple example for memory read machine cycle is MVI D, 24H. The byte specified by the second operand is copied to the location specified by the first operand.
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