How can i take the output of a phase accumulator as clock by taking 24th bit?

In my project I'm using DCO which includes a phase accumulator with 25 bits(0-24).From the output of phase accumulator i have to choose 24th bit as one clock and 23rd bit as another clock.What is the logic behind it .What is the difference in frequencies of these clocks.I'm using VHDL for coding.