Jitter on PWM on P1.2/T0 of P89LPC932

[J So]

Configuring P1.2/T0 as PWM output using Timer 0 mode 6, I find jitter on the output waveform.  In the application, T1 is used as a ms timer with a reload value for TH1 and TL1 in T1's interrupt service routine.  I have tried  disabling T1 interrupt, the jitter is still there.  How can the jitter be eliminated?

Thanks,

J So

[Andy Ayre]

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