Give this thread a read. It describes how to make a synchronous, mod-10 counter, but the idea is the same regardless of whether it is an up counter, down counter, gray code counter, etc. If you understand the process, you can make it follow any kind of state transitions you want.How to make a D-flip flop down counter count from 5 to one on schematics???
by Jake Hertz
by Jake Hertz
by Aaron Carman
by Jake Hertz