Question

A 4-bit up/down binary counter is in the down mode and in the 1100 state currently. To what state does the counter go on the next clock pulse

Answer 1

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Answer 2

The 4-bit up / down binary counter is in down mode and is currently in state 1100. The state of the counter at the next clock pulse is 1011.

Explanation:

• The 4-bit synchronization counter counts sequentially with each clock pulse, resulting in an output counting up from 0 (0000) to 15 (1111). Therefore, this type of counter is also known as a synchronous 4-bit up counter.
• If the external input UP is  1, the circuit acts as a UP counter independently of the DOWN input, counting sequences from 0000 to 1111.
• If the external input DOWN is  1 and UP is  0, the circuit acts as a DOWN counter and counts. Sequence from 1111 to 0000.
• If both inputs UP and DOWN are equal to 0,  the output of the flip-flop is unchanged.