Help me.ALP for PWM using timer interrupts

Hi ,

I am nanna.Please help me to write software(ALP) for produce pulse width waveform .i want to produce pwm about (1ms)1Khz for different duty cycle using timer interrupts.'coz i will load the timer different ON/OFF value.We have 6 levels to be load into timer.
for example :
level 01= ON time 250usec
OFF time 750usec

Like wise i have to change upto 6 levels.moreover level is to be send by user by external interrupts.It doesn't affect PWM.
Please give me a proper solution to do that.
I am waiting for ur prompt reply.


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