1. Dept. of Electrical and Computer Eng., NCTU
Lab 11. Mod 6 Counter
Presenter: Chun-Hsien Ko
Contributors: Chung-Ting Jiang and Lin-Kai Chiu
Dept. of Electrical and Computer Eng., NCTU

2. Dept. of Electrical and Computer Eng., NCTU
Combinational Logic vs. Sequential Logic
States of Sequential Logic
Mod 6 Counter
State Machine of Mod 6 Counter
Asynchronous Counter
Circuit Design of Mod 6 Counter
LAB 11: Mod 6 Counter
Bonus: Mod 6 Up/Down Counter
Dept. of Electrical and Computer Eng., NCTU

3. Dept. of Electrical and Computer Eng., NCTU
Combinational Logic vs. Sequential Logic
𝑂𝑢𝑡=𝐹(𝐼𝑛)
𝑂𝑢𝑡=𝐹(𝐼𝑛, 𝑝𝑟𝑒𝑣𝑖𝑜𝑢𝑠 𝐼𝑛)
Dept. of Electrical and Computer Eng., NCTU

4. Dept. of Electrical and Computer Eng., NCTU
Sequential Logic
q depend on the number of states
Dept. of Electrical and Computer Eng., NCTU

5. Dept. of Electrical and Computer Eng., NCTU
State Machine of Mod 6 Counter
How to reduce the 3-bit Counter to Mod 6 Counter?
Dept. of Electrical and Computer Eng., NCTU

6. Dept. of Electrical and Computer Eng., NCTU
State Machine of Mod 6 Counter
Clear the State when current State is equal to (110)
Clear !!
Dept. of Electrical and Computer Eng., NCTU

7. Dept. of Electrical and Computer Eng., NCTU
Falling-edge Trigger JK Flip-Flop
Asynchronous Clear
Dept. of Electrical and Computer Eng., NCTU

8. Dept. of Electrical and Computer Eng., NCTU
Circuit Design of Mod 6 Counter
State=(110)
Dept. of Electrical and Computer Eng., NCTU

9. Dept. of Electrical and Computer Eng., NCTU
LAB 11: Implement a Mod 6 Counter
IC and devices：
7473 x 2
7432 x 1
LED x 3
Clock Source:
NC555 x1
470K Resistor x2
1 uF Capacitance x1
Bonus: Mod 6 Up/Down Counter
Design the circuit in your report
Also implement the circuit
Dept. of Electrical and Computer Eng., NCTU