How to set up a timer

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Just a quick note. This code sets up a timer (TIMER0) at 1000Hz. An interrupt for the timer is registered that calls the function timerHandler on every tick, i.e. 1000 times a second. 

 u16 freq = 1000;
 TIMER0_DATA = TIMER_FREQ(freq);
 TIMER0_CR = TIMER_ENABLE | TIMER_DIV_1 | TIMER_IRQ_REQ;
 irqSet(IRQ_TIMER0, timerHandler);
 irqEnable(IRQ_TIMER0);

Important: The minimum argument of TIMER_FREQ is 512. Lower frequencies can be achieved using the TIMER_DIV_X flag.

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