Down Counters and Up-Down Counters in Digital Electronics
How to design a synchronous counter 4 bit using JK flip flop that can count up even numbers from 0 to 14, and count down odd numbers from 15 to 0 in 1 system - Quora
DeldSim - 4-Bit Down Counter
4 Bit Down Counter
Digital Asynchronous Counter (Ripple Counter) - Types & Application
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