The part of execution in which an operand or instruction is read from main storage and written into a control unit or arithmetic unit register.
执行过程中的一个阶段所需的时间，在此期间，计算机从主存储器中取出指令或操作数，并将其存入控制器或运算器的寄存器中。
ARM chip is chosen as the master chip of main control unit, main control unit includes data storage circuit and key and LCD display interface circuit besides.
主控单元的主控芯片选用了ARM芯片，并配以数据存储电路、按键和液晶显示接口电路。
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