Realizes through programmable logical component PLD, its time cycle is 24 hours, demonstrated the full scale division is 23 hours 59 minute 59 seconds, moreover manual replacement function.
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- 通过可编程逻辑器件PLD来实现,它的计时周期为24小时,显示满刻度为23时59分59秒,另外手动复位功能。