3-Bit programmable counter.  Inputs Cx are used to set up number of cicles to count.  Cicles always starts at 000 and ends up (including) when (C2 C1 C0) - 1 is reached.  For counting 4 cicles, C2 C1 C0 must be set up to 100 (4 decimal).  The count will be:
000 001010011This counter might be useful for CPU instruction cycles control