Page 122 - Handout Digital Electronics
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Figure 53: Two-bit binary up counter
The state table below shows the operation of the 2-bit binary UP counter
INPUT S Present State External Next State
C J K A B X A B
1 0 0 0 0 0 0 0
1 1 1 0 0 1 0 1
1 1 1 0 1 1 1 0
1 1 1 1 0 1 1 1
1 1 1 1 1 1 0 0
The binary UP counter will not count upwards whenever the external signal is equal to zero (0).
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