【ATmega4809 Curiosity Nano Review】Timer

dcexpert

【ATmega4809 Curiosity Nano Review】Timer [Copy link]

The timer of ATmega4809 is similar to that of ordinary AVR, but it has many more functions and its usage is more complicated.

The following program uses the normal mode of TCA. When the timer overflows, an interrupt is generated and the LED is flipped in the interrupt.

#define F_CPU 20000000L/6

#include <xc.h>
#include <avr/interrupt.h>

SIGNAL(TCA0_OVF_vect)
{
    TCA0.SINGLE.INTFLAGS |= (1<<0);
    PORTF.OUTTGL |= (1<<5);
}

int main(void) {
    
    // PF5 as LED
    PORTF.DIR |= (1<<5);
    
    //TCC0
    // NORMAL mode
    TCA0.SINGLE.CTRLB = 0;
    // DIV1024
    TCA0.SINGLE.CTRLA |= (7<<1) | (1<<0);
    // OVF interrupt
    TCA0.SINGLE.INTCTRL = (1<<0);
    TCA0.SINGLE.PER = F_CPU/1024;
    
    // enable interrupt
    sei();
    
    while(1)
    {
        
    }
    
    return 0;
}

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