38.5.1 Impact of using the prescaler and multiplication factor on
timing resolution
Use of prescaler and multiplication factor greater than 1 limits the count/delay accuracy
in terms of peripheral clock cycles (to the modulus of the prescaler X multiplication
factor). If the multiplication factor is set to 1 and the prescaler is set to 2 then the only
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 a prescaler
set to 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.
Chapter 38 Programmable Delay Block (PDB)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 889
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