os_time_delay in milliseconds / microseconds

[then yon]

Dear Support,

I'm working on a timing critical app; but the os_time_delay didn't gave 
me a precise timing.

Currently the min delay i can get is more than 2ms with os_time_delay 
function.

Somehow i notice that the clock time have up to microsecond precision; 
but how do i make a delay with that?

Thank you.

Regards,

Then Yoong Ze