In Lab $4,$ you have designed a digital clock that can display hours, minutes and seconds in decimal numbers on a $7$ segment LED display as $$HH:MM:SS$.$ In this homework, you would need to add the following functionalities into the digital clock:

$1.$Include the option for the clock to be changed from $24$ hour mode to $12$ hour mode. In $12$hour mode, use $$A$$ on LED indicates AM and $$P$$ indicates PM

This is the clock that I in lab $4(24$hrs clock$)$ I don't understand how to make a modulo $12$ counter so that the first digit goes from $01,02,...,09$ to $10,11,12$ and then go back to $01,$ instead of $13.|$