CHAPTER 4 COUNTER.

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Presentation transcript:

CHAPTER 4 COUNTER

Types of Counter Asynchronous counter Synchronous counter Asynchronous counter :- for these counter the external clock signal is applied to one flip-flop & then the o/p of preceding flip-flop connected to clock of next flip-flop. Synchronous counter :- for these counter all the flip-flop receive the external clock pulse simultaneously.

Asynchronous counter Counter means count no of clock pulses which counter has received. Up counter count up counting i.e. 0 to 3 etc. No. of state depends on 2n n is no of f/fs The maximum count is (2n -1)

Asynchronous counter 2-bit Asynchronous counter Up counter (Ripple Counter)

2-bit Asynchronous counter Up counter (Ripple Counter)

2-bit Asynchronous counter Up counter (Ripple Counter)

2-bit Asynchronous counter Up counter (Ripple Counter)

3-bit Asynchronous counter Up counter (Ripple Counter)

3-bit Asynchronous counter Up counter (Ripple Counter)

3-bit Asynchronous counter Up counter (Ripple Counter)

4-bit Asynchronous counter Up counter (Ripple Counter)

4-bit Asynchronous counter Up counter (Ripple Counter)

4-bit Asynchronous counter Up counter (Ripple Counter)

State diagram The state diagram represents the states of a counter graphically.

Modulus counter The 2 bit counter is called as MOD-4 counter MOD number = 2n Modulus means no. of states through which the counter progress during ts operations.

Mod -3 asynchronous counter using 2- bit ripple counter

Mod -3 asynchronous counter using 2- bit ripple counter

Mod -3 asynchronous counter using 2- bit ripple counter

Mod -3 asynchronous counter using 2- bit ripple counter

Modulo-5 ripple counter using a 3-bit ripple counter

Modulo-5 ripple counter using a 3-bit ripple counter

Modulo-5 ripple counter

Modulo-5 ripple counter

MOD-6 asynchronous counter

MOD-6 asynchronous counter

MOD-7 asynchronous counter up counting using T flip-flop

MOD-7 asynchronous counter up counting using T flip-flop

MOD-7 asynchronous counter up counting using T flip-flop

MOD-12 asynchronous counter

MOD-12 asynchronous counter

MOD-12 asynchronous counter

MOD-12 asynchronous counter

MOD-11 asynchronous counter

MOD-11 asynchronous counter

MOD-11 asynchronous counter

MOD-11 asynchronous counter

MOD-11 asynchronous counter

MOD-4 asynchronous counter

MOD-4 asynchronous counter