Introduction - If you have any usage issues, please Google them yourself
The program is to simulate the clock program of the school; CLK - clock signal, RST - zero signal, set_en- school
To signal, faster-- fast forward signal, slower-- quick exit signal, hour-- hour school, min-- minute school
At the time, (hh, hl,ml,mh,sh, sl) - minute, second display signal.
At school time, the seconds are clear.
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