Control an MC145152 (PLL) by a processor

[sonoman]

Hi all,

I'm trying to drive an MC145152 (PLL) by a Pic processor through an MCP23s17.
The MCp23s17 replaces the programming DIPs.
I need help creating the routine in C to decompose a decimal number into a sum of powers of two.
The decimal number can range from 3 to 1023 (Counter N).
I stay in the program, I almost finished, I stumble on it.
Thank you
Fanch