WizenedEE:
mkwired:
The interrupt vector is stored in the PROGRAM (FLASH) space. This means it cannot be changed during program execution. I don't know of a way to implement an ISR for timer0 using the Arduino IDE. Also, I don't know how you came up with 976,56 Hz (976.56 Hz for the rest of us), but the prescaler is set to 64 so the frequency is 16.000.000 / 64 which equals 250kHz.The interrupt itself only fires when the timer overflows. Remember, the millis interrupt fires every millisecond (1kHz)
I was confused... I was talking about the frequency of the timer and not of the frequency of the interrupts.