Below is the circuit diagram of the 24/ twenty-square counter
On the basis of hexadecimal, the feedback zeroing method can be used to form a twenty-four-square counter. The counting range is 0~23, and 24 is the transition state. When the high bit counts to 2 and the low bit counts to 4, the counter returns to zero. Connect Q20 and Q11 directly to R0A and R0B to form a quaternary counter. The circuit is shown in Figure 12.9. 
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