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Timer configurations f28335

Hi Together,

I write a timer hardware abstraction layer for the tms 320f28335, and I could not get the informations in the Documentation about the timer prescale value.

 

with the default example configurations of the timer, no prescale value is set (prescale =1), its shown in the folowing code:

   CpuTimer0Regs.TPR.all  = 0;
   CpuTimer0Regs.TPRH.all = 0;

   CpuTimer0.RegsAddr->PRD.all = CPU_FRQ* 1000000;

I want to configure a higher prescale counter, to take a 30s measurement, but I do not find out, how the prescale works so the configuration of

   CpuTimer0Regs.TPR.all  = 1;
   CpuTimer0Regs.TPRH.all = 0;

   CpuTimer0.RegsAddr->PRD.all = CPU_FRQ* 2000000;


must be the same time, to take a interrupt if the prescaler divide the sysclockout with 2 - but it is'n the same time...

 

Can you help me and tell how the timer prescaler works ?

 

Regards,

Heiko