two timers in the same time? how may i do this

[nfs]

i want to trig two timers in the same time, what's the solution.
timer_1 to count 2 second and test therefore the input voltage if it changes or no. the second timer is the timer_2 who will sample the same voltage input in every 100�s.
this two timers must be one time which a led will be high.
if anyone help me, i give him an additionnal information
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nfs

[Haplo]

If I understand correctly, you want both timers to have the same source. Configure Timer1 or Timer2 module of the PIC to overflow every 100us. Enable the timer interrupt. In the ISR, increment a long counter and set a flag. In your main(), in a loop check if the flag is set. If it is do whatever you want your timer_2 to do and reset the flag. Also in the same loop check the value of the counter, when it reaches 2000000 it means 2 seconds have passed. Do your timer_1 action there and clear the counter.

[nfs]

the source is the same but the problem is: how can i program the two timers to start on the same time?
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nfs

[Neutone]

So you want ot take 20K samples and then do a compare? Load a counter with 20000 and decrement in the timer interupt every 100uS. When it gets to zero do the compare and load the counter again. You don't need to use two timers.

[nfs]

in this case i will use the timer_1 as a counter!!!!
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nfs