instruction cycle


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instruction cycle

[in′strək·shən ‚sī·kəl]
(computer science)
The steps involved in carrying out an instruction.

instruction cycle

The fundamental sequence of steps that a CPU performs. Also known as the "fetch-execute cycle," it is the process whereby a single instruction is executed. The first half of the cycle transfers the instruction from RAM to the instruction register (fetch) and decodes it. The second half executes the instruction. See machine language.
References in periodicals archive ?
The PIC12CR509A features 1024 words of ROM program memory, 41 bytes of user RAM, six I/O pins with on-chip clock oscillator, 33 single-word instructions, full-speed 1 microsecond instruction cycle at 4 MHz, seven special function hardware registers, two-level deep hardware stack, 8-bit real time clock/counter with 8-bit programmable prescaler, watchdog timer, direct LED drive, low 2.
Other performance features of the 68EC020 include advanced bit manipulation capabilities that provide multiple bit shift operations in a single instruction cycle.
A four-stage (fetch-decode-execute-write back) pipeline executes one instruction per clock cycle, yielding a 20 ns instruction cycle when running at 50 MHz.
highest-in-class performance of 50ns per instruction cycle, an increase of 250% over previous IKAP MCUs
Its Advanced Interrupt Controller enhances the basic interrupt facilities of the ARM7 processor to give vectored priority interrupt handling in a minimum number of instruction cycles.
By offloading the overhead of basic processing functions, the ARM processor is freed up to dedicate its instruction cycles to the more complex processing functions it is optimized for.
While existing solutions may take hundreds of instruction cycles to process a packet, IDT's IP co-processor can perform the task in a single clock cycle, an order of magnitude improvement when compared with alternative search solutions.