I understood it can divide by n from 3 to 15999. However how can I set the
value of n? Thanks
These chips have what they call "address lines" which are basically
pins set aside for the application of control voltages which determine
the degree of division. The chip just 'looks for' the presence or the
absence of a voltage (usually 5V) on each of those pins, different
combinations of ons and offs give different rates of division. You can
fix the division rate manually by hard-wiring the voltages to the
appropriate pins, or to vary the division you can use a rotary encoder
switch, or a microprocessor or whatever.