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I asked directly Darrel Taylor (Technical Support) and he gave be the good answer :

I simply need to clear the interrupt flag (TMR2IF) in PIR1 before leaving the Interrupt Service Routine
...

Demon,

Thank you for your advice.

Of course I did what you suggest : write a very small program and test it and that's how I found that the problem was coming from ReadCode and its execution...

Hi mark_s,

The data, as read by Readcode are organized in bytes, not in words and declared by DB instructions .
For example, this is a line from the data tables :
DB 67, 67, 82, 67, 66, 67,...

Hi,

I am trying to generate an audio wave using the PWM of a 18F2685 working at 32 MHz (with PLL)
The sampling rate is about 58 kHz, provided by the PWM.
I'am using PBP 3.0 and a PicKit 2 for...