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Difference between RISC and CISC

written 6.0 years ago by teamques10 ★ 68k

•   modified 5.0 years ago

microcontroller and embedded programming

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written 6.0 years ago by teamques10 ★ 68k

RISC	CISC
Multiple register sets, often consisting of more than 256 registers	Single register set, typically 6 to 16 registers total
Three register operands allowed per instruction (e.g add R1, R2, R3)	One or two register operands allowed per instructions (e.g add R1, R2)
Parameter passing through efficient on-chip register windows	Parameter passing through inefficient off-chip memory
Single-cycle instructions (except for load and store)	Multiple cycle instructions
Hardwired control	Microprogrammed control
Highly pipelined	Less pipelined
Simple instructions that are few in number	Many complex instructions
Fixed length instructions	Variable length instructions
Complexity in compiler	Complexity in microcode
Only load and store instructions can access memory	Many instructions can access memory
Few addressing modes	Many addressing modes

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