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
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EE 201P
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4-bit Mod-12 Synchronous Counter using D flip-flop || Sequential Logic Circuit | Digital Electronics - YouTube
Design a Synchronous Counter Using D Flip Flops - YouTube
Synchronous Counter and the 4-bit Synchronous Counter
Basic Tutorial Lesson 11: Building a Binary Counter Using JK Flip-Flops - Emagtech Wiki