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The instruction cycle is the basic operation cycle in a computer. This is what will take in data, process it and execute as required.
Delia Auer
Wiki User
∙ 11y agogenerally instruction cycle is nothing but the combination of fetching cycle and execution cycle.the process from fetching the instruction from memory till execution of that instruction ,is called instruction cycle.
interrupts afftect instruction cycle. :)
Wiki User
∙ 9y agoThe instruction cycle is the basic operation cycle in a computer. This is what will take in data, process it and execute as required.
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What is the purpose of RST instruction in microprocessor?
Special restart instruction used with interrupts
Name of instruction to reset the interrupt?
software interrupts
How many instruction in 8051 microcontroller?
how many interrupts in 8051
What is the sequence of micro operation of an interrupts and interrupts return cycle?
Mbr<-pc mar<-x pc<-y memory<-mbr
What is the difference between instruction cycle and machine cycle?
an instruction cycle may consist of a number of machine cycles.
What is the difference between bus cycle and instruction cycle?
Bus cycle - clock cycles taken to complete one bus transaction. Instruction cycle - clock cycles taken to complete execution of one instruction
What are the phases of instruction cycle?
There are four phase of an instruction cycle namely: fetch; indirect; execute; write.
Explain instruction cycle?
An instruction cycle is the rudimentary operation cycle of any computer. It involves the CPU fetching a program from memory and executing it fully.
How does the CPU keep track of which instruction to execute next?
The instruction register holds a pointer to the current instruction (in working memory) while the next instruction register points to the next instruction (the first instruction immediately after the current instruction's operands). If the current instruction is a jump instruction, it can change the next instruction register, allowing the program to branch to a new instruction once the jump instruction is processed. The next instruction pointer is automatically moved into the current instruction register once the current instruction has been processed. The entire process of executing an instruction is known as the fetch-decode-execute cycle.
Which register is used to set priority for interrupts?
The 8085 does not have an adjustable priority interrupt schema. You can only turn interrupts off, and mask certain interrupts, such as RST5.5, RST6.5, and RST7.5. However, that said, you can implement a priority schema, of sorts, within these interrupts, including INTR, by using the SIM instruction. You can't change the basic priority but you can disable certain interrupts while others are being serviced, if you so choose.
What is the meaning of maskable hardware interrupt?
A maskable hardware interrupt is one that can be disabled, or masked, by instructions in the CPU. In the 8085, all interupts except TRAP and (software) RST N can be masked by disabling interrupts, and RST7.5, RST6.5, and RST5.5 can be individually masked with the SIM (Set Interrupt Mask) instruction. In general, you leave interrupts disabled until one instruction before returning. In the case of the RST*.5 interrupts, you can mask it during interrupt processing and then enable interrupts, allowing other levels to interrupt you again. At the conclusion of the interrupt routine, you would disable interrupts, restore the mask, enable interrupts, and return. If you use this method, you can choose the nesting priority as desired. You determine what mask to set using the RIM (Read Interrupt Mask) instruction and then do bit manipulation before using SIM.
How would you describe the fetch execute cycle?
Fetch Execute Cycle A more complete form of the Instruction Fetch Execute Cycle can be broken down into the following steps: 1. Fetch Cycle 2. Decode Cycle 3. Execute Cycle 4. Interrupt Cycle 1. Fetch Cycle The fetch cycle begins with retrieving the address stored in the Program Counter (PC). The address stored in the PC is some valid address in the memory holding the instruction to be executed. (In case this address does not exist we would end up causing an interrupt or exception).The Central Processing Unit completes this step by fetching the instruction stored at this address from the memory and transferring this instruction to a special register - Instruction Register (IR) to hold the instruction to be executed. The program counter is incremented to point to the next address from which the new instruction is to be fetched. 2. Decode Cycle The decode cycle is used for interpreting the instruction that was fetched in the Fetch Cycle. The operands are retrieved from the addresses if the need be. 3. Execute Cycle This cycle as the name suggests, simply executes the instruction that was fetched and decoded
