Compare, distinguish and explain what is the difference between CISC and RISC processors.

Difference between CISC and RISC processors

1. CISC is an abbreviation of Complex Instruction Set Computer. RISC is an abbreviation of reduced Instruction Set Computer.

2. When an MCU supports many addressing modes for arithmetic and logical instructions and for memory accesses and data transfer instructions, the MCU is said to have CISC architecture. When an MCU has an instruction set that supports one or two addressing modes for arithmetic and logical instructions and few for memory accesses and data transfer instructions, the MCU is said to have RISC architecture.

3. CISC can process large number of complex instructions. RISC ca process small number of instructions.

4. CISC instructions are of variable number of bytes and take varying amount of time for execution. RISC instructions are of fixed number of bytes and take fixed amount of time for execution.

   
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