[SOLVED] changing the mode operation of atmega128

[fateme91]

Hi
I need to change the mode of micro. As a micro turns on a LED then go to sleep, power down.

What shoud i do by hardware and software in codevision?

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what is the lowest energy usage?

 

[ud23]

what have you done till now for the application?Provide some information about it.
Do some basic stuffs read the atmega128 datasheet thoroughly first.
You get many help about sleep mode and energy usage.
Do refer the power management and sleep mode section at page number 44 of datasheet.

 

[fateme91]

I read this at codevsion

while (1)
{
{

PORTD.0 = 1;
delay_ms(500);
PORTD.0 =0;
delay_ms(500);



PORTD.0 =0;
delay_ms(2000);

MCUCR=0b00111000;
#asm("sleep");

}
}


It is power save mode and it works. Now I need a TIMER2 with crystall 32768Hz. I need an interrupt each 1 second.
what else should i do in software and hardware???

 

[ud23]

http://www.atmel.com/images/doc2505.pdf

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http://www.avrfreaks.net/forum/tut-c-newbies-guide-avr-timers

this link help you a lot to learn