K60P100M100SF2RM Datasheet, PDF (926/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Application Information
values of total peripheral clocks that can be detected are even values; if prescaler is set to
4 then the only values of total peripheral clocks that can be decoded as detected are
mod(4) and so forth. If the applications need a really long delay value and use 128, then
the resolution would be limited to 128 peripheral clock cycles.
Therefore, use the lowest possible prescaler and multiplication factor for a given
application.
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
926
Freescale Semiconductor, Inc.