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

• 分析发现,在传统八位微处理器设计中,影响其整体性能的主要原因是:基于累加器的ALU结构、CISC指令体系、时钟系统设计以及系统构架。