different software times, impossible?

[richard]

it would be relatively easy to to emit 400 cycles of a 50% pw 600uS period wave [x] using a ccp module while toggling another pin at 2 to 12 mS intervals (100-600 pulses) . the pin toggle isr would count down the desired number of [y ] pulses (the period being predetermined) and terminate the ccp output and itself at that point . if a 16 bit timer is used for the isr then the resoution would be reasonable with a 20mhz clk.
you could also look at a PoKeys57 module or an arduino running GRBL.
your description of the problem at hand lacks sufficient detail for me to progress beyond this point , a classic xy problem http://xyproblem.info/

[lutherblisset]

hello richard so its possible to stop the pwm after a fixed time? Maybe its a solution, cause the 400 steps (or always multiply of 400) are fixed, i need only to stop the pwm output after the same time of y, its possible to stop the pwm at the exact point from the software?

[richard]

CPRxCON=12 PWM ON
CPRxCON=0 PWM OFF

You may need to set the CCPx output pin to 0 if the pin idle state is critical

[lutherblisset]

the lowest possible hpwm frequency is 245 hz (for a 4mhz quartz) and 1221hz for a 20mhz quartz, now i have to calculate the frequency of 400 pulses.....

[richard]

try this

[lutherblisset]

400*300+300=240.000 us
1.000.000 us /240.000 us =4,1666666667
4,1666666667*400 pulses =1.666,66666668 hz for one second if the quartz is precise.......

[lutherblisset]

the pwm work good and the frequency counter confirm the exact frequency and its possible to stop it at a fixed point, now i need a second timer to count the y pulses other than 400) with a same time of x. The x train with 400 pulses do the work in: 400*300+300=240.000us. I need the same time for y, with pulses other than 400....