ECE 3130 – Digital Electronics and Design Lab 7 Binary Counter Fall 2012 Allan Guan.

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ECE 3130 – Digital Electronics and Design Lab 7 Binary Counter Fall 2012 Allan Guan

Introduction A binary counter is a device that stores the number of times that an event/process occurs Up/down counter – When the selector is in the up state, the counter increments its value – When the selector is in the down state, the counter decrements its value Allan Guan

JK Flip-Flops A universal flip-flop – can be configured as a SRFF, DFF, or TFF Identical to an SR flip- flop except that S=R=1 is no longer undefined, but rather “toggle/flip” J/SK/RQnext 00Q (hold) nQ (toggle) Allan Guan

Master-Slave JKFF Implementation Allan Guan

Up/down counter using T Flip-Flops Circuit SymbolTruth Table TQQnext Tie the J and K inputs of the JKFF to make a TFF. Allan Guan

4-bit Up/Down Binary Counter Allan Guan

Analysis What are some applications of counters? Allan Guan