Through controlling an N-bit accumulator and then get its highest bit to generate the programmable clock.
通过控制一个N位累加器累加，取其最高位，即可得到可编程时钟源。
This moves the carry into bit position of the accumulator.
把进位移到累加器的位元。
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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