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What part of the processor indicates which machine instruction in next in line for execution?
The part of the processor that indicates which machine instruction is next in line for execution is called the Program Counter (PC). The Program Counter holds the memory address of the next instruction to be fetched and executed. After the current instruction is executed, the PC is updated to point to the subsequent instruction, ensuring the sequential flow of execution in a program.
What is an instruction phase together with the execution phase called?
The instruction phase together with the execution phase is called a "Machine Cycle".
What step of the machine cycle translates and instruction in the forms at the processor can understand?
The step of the machine cycle that translates an instruction into a form the processor can understand is called the decode phase. During this phase, the instruction fetched from memory is interpreted by the control unit, which determines the necessary actions and the data required for execution. This involves converting the instruction into signals that can control the processor's operations, allowing it to perform the specified task.
IS OPCODE FETCH MACHINE CYCLE ENOUGH FOR THE INTRUCTION MOV MA IN 8085 TIMING DIAGRAM?
In the 8085 microprocessor, the opcode fetch machine cycle is not sufficient on its own for executing the MOV MA instruction. While the opcode fetch cycle is responsible for retrieving the instruction from memory, additional machine cycles are required to perform the data transfer or execution of the instruction. Specifically, the MOV MA instruction involves both an opcode fetch cycle and a memory access cycle to complete the operation. Therefore, multiple machine cycles are necessary for executing this instruction effectively.
What is a cycling machine?
Each time the CPU executes an instruction, it takes a series of steps. The complete series of steps is called a machine cycle. A machine cycle can be divided into two smaller cycles. These are instruction cycle and execution cycle. Instruction cycle: In instruction cycle CPU takes two steps-- 1. Fetching: Before the CPU can execute an instruction, the control unit must retrieve or fetch a command or data from the computer's memory. 2. Decoding: Before a command can be executed, the control unit must decode the command into instruction set. Execution cycle: In execution cycle CPU also takes two steps-- 1. Executing: When the command is executed, the CPU carried out the instructions in order by converting them into macrocode. 2. Storing: The CPU may be required to store the result of an instruction in memory.
What is the use crystal 11.0592MHZ?
this crystals deter mains how many no of machine cycles are need for the execution of one instruction
What is a micro-instruction?
microinstruction: An instruction that controls data flow and instruction-execution sequencing in a processor at a more fundamental level than machine instructions. Note: A series of microinstructions is necessary to perform an individual machine instruction.a micro instruction specifies one or more micro oprations for the system.
How many machine cycles in the XCHG instruction?
Summary − So this instruction XCHG requires 1-Byte, 4-Machine Cycles (Opcode Fetch) and 4 T-States for execution as shown in the timing diagram.
How to calculate the number of machine cycle and opcode fetch of any instruction?
To calculate the number of machine cycles and opcode fetches for any instruction, you need to refer to the architecture's documentation, which outlines the instruction set and the corresponding cycles for each instruction. Typically, an opcode fetch counts as one machine cycle, and the total machine cycles for an instruction will depend on its complexity and any additional operations it requires, such as data fetches or memory accesses. Analyze the instruction's microarchitecture to determine the number of cycles needed for its execution, including any potential delays or dependencies.
Timing diagram of 8085?
Timing Diagram is a graphical representation. It represents the execution time taken by each instruction in a graphical format. The execution time is represented in T-states.Instruction Cycle:The time required to execute an instruction is called instruction cycle.Machine Cycle:The time required to access the memory or input/output devices is called machine cycle.T-State:The machine cycle and instruction cycle takes multiple clock periods.A portion of an operation carried out in one system clock period is called as T-state.MACHINE CYCLES OF 8085:The 8085 microprocessor has 5 (seven) basic machine cycles. They areOpcode fetch cycle (4T)Memory read cycle (3 T)Memory write cycle (3 T)I/O read cycle (3 T)I/O write cycle (3 T)Each instruction of the 8085 processor consists of one to five machine cycles, i.e., when the 8085 processor executes an instruction, it will execute some of the machine cycles in a specific order.The processor takes a definite time to execute the machine cycles. The time taken by the processor to execute a machine cycle is expressed in T-states.One T-state is equal to the time period of the internal clock signal of the processor.The T-state starts at the falling edge of a clock.
What are the 4-step machine cycle and describe what occurs at each step?
The 4-step machine cycle consists of Fetch, Decode, Execute, and Store. Fetch: The CPU retrieves an instruction from memory, using the program counter to determine the address. Decode: The fetched instruction is interpreted to understand what action is required, identifying the operation and the operands involved. Execute: The CPU performs the operation specified by the instruction, which may involve arithmetic calculations or data manipulation. Store: Finally, the result of the execution is written back to memory or a register, completing the cycle before moving on to the next instruction.
What is the Difference between machine op and pseudo op?
A pseudo-op is an assembly language instruction that specifies an operation of the assembler i.e about the base register & its contents e.g. USING instruction. On the other hand, a machine-op instruction. That represents a machine instruction to the assembler e.g. BR instruction is a machine-op instruction
