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A. 8051有两个16位可编程定时/计数器，T0和T1。它们的功能可由两个控制寄存器（ TCON ） 、（ TMOD ）的内容决定，且定时的时间或计数的次数与（ TH）、（ TL）两个寄存器的初值有关。
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