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- 利用AT89C51单片机的定时,定时计数器T0秒,秒计数的时候,第二代,再加上1秒计数,计数到60秒,自动从0开始。单片机12MHz晶振频率-Using AT89C51 single-chip timing, timing counter T0 seconds, seconds count as a time when the second generation, plus 1 seconds count, count to 60 seconds, automatically the begi