Speed vs Consumption.

Just a really quick n’ dirty test of the running frequency of an Atmel ATmega8 AVR mcu versus the power consumption. I used a really simple program for this. No sleeping modes whatsoever. Every time I compiled the code for the specified frequency (-D F_CPU=) and used an external crystal as a clock source. The maximum frequency for an ATmega8 is 16 MHz, but we can slightly over clock it (18-somethign MHz) if the voltage is kept at 5 volt.


#include <avr/io.h>
#include <util/delay.h>

int main(void){

    DDRB |= (1<<PB1);
    uint16_t i;

      PORTB ^= (1<<PB1);

    return 0;

We can see that the power consumption increases almost linearly. The voltage is kept constant at 5.02 volts.



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