In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJMonty wrote:

CBMeeks,

Another (potential) option is to use a smaller pre-scale, and multiple interrupts to accumulate the exact time you need. 

For example, if you set your pre-scale to 1:2, then "retiw w, #-250" would give you 250 * 2 = 500 clocks.  Do this five times, and you have accumulated a total of 5 * 500 = 2500 clocks.  When this happens, you change the return line to be "retiw w, #-21", which will give you 21 * 2 = 42 clocks, for a total of 2542 clocks.  

Of course, this assumes that you can divide up your work in the interrupt handler across multiple interrupts.  IF you can't, then you example of the 1:16 pre-scale is the way to go.


[list]Thanks,
PeterM[/list]

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