ATM89c51 microcontroller based digital electronic clock design 1 the normal digital clock counts per second, when the day had 24 points to progress in the position 2 digital clock and calendar can be between the key switch 3 hours, minutes, day, month, Adjustable, respectively 4 adjustable and can control the adjustable bit keys were hidden state control, easy to know which is adjustable.

shuzizhongwannianli.txt

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