Hi, this is the first time that i'm using this forum, i need some help with a school project that is basically a counter that counts from 99 to 00, but i need to control both digits using 2 push button, until there i did everything without problem, but the main problem is that i don't know how to add the start/pause button in my circuit, i would like to know if someone can help me, i'm using the IC 74ls192 to control the digits of the 7 segments display and i'm using the 74ls47 to connect it to display (the pin 11 is not doing anything for now), also when the counter hits 00 he must stop without restarting itself.