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The design trend toward heavily microcoded processors with complex instructions began in the early 1960s and continued until roughly the mid-1980s. At that point the [[RISC]] design philosophy started becoming more prominent.
A CPU that uses microcode generally takes several clock cycles to execute a single instruction, one clock cycle for each step in the microprogram for that instruction. Some [[Complex instruction set computer|CISC]] processors include instructions that can take a very long time to execute. Such variations interfere with both [[interrupt_latency|interrupt
When designing a new processor, a [[hardwired control]] RISC has the following advantages over microcoded CISC:
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