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I've been having issues getting the Timer 4 to work with the PCA0. This was with the C8051F580 and I've tried setting it up with the registers set as specified with the configuration wizard. The timer 4 interrupt works when enabled but I'm not able to get the PCA0 interrupt working using the timer 4.
it is a bad idea to have an interrupt for the timer driving the PCA
show your initialization code