It has been found that the major limitations of typical 8-bit MCU are the ALU structure based on accumulator and the CISC architecture adopted in MCS-51 design.

分析发现，在传统八位微控制器设计中，基于累加器的ALU结构及CISC指令体系及系统构架是影响其整体性能的主要原因。

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It has been found out that the key factors of affecting its performance are the ALU structure based on accumulator, the CISC architecture and the time of executing instructions.

分析发现基于累加器的ALU结构、CISC指令体系及指令的执行时间是影响其性能的关键因素。

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The other main type of processor architecture, CISC (the x86 processor being a popular CISC instruction set), allows for memory access in nearly every instruction.

另外一种主要的处理器体系结构CISC (x86处理器就是一种流行的CISC指令集)几乎允许在每条指令中进行内存访问。

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Joel Birnbaum was the head of HP Labs at the time and he knew that RISC (Reduced Instruction Set Computing)architecture was the future and not CISC (Complex Instruction Set Computing).

FORBES: Question of the Day: Why Does HP Continue to Screw Up?