seema joshi wrote:
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But it has got some friquency limitations.
Because the PWM counter is 8 bits only.
;
According to me not to put 552 for the PWM feature.
I can implement the same logic using the timer also.

At 12Mhz 80552 can give you 23.5Khz(highest)
and 92Hz(Lowest).If you need slower rate you
can always choose slower crystal and for faster rate a faster one.If you wish to implemnt 23.5 KHz at 12 Mhz in normal timer you need to use T0/T1 with count of 42/43.A simple interrupt branch and RETI shall take 5 us.At high frequency your accuracy is compromised.The hardware PWM frees you from this trouble.And you save one timer.
Pranav