atmega8 example: timer T1 normal mode-EEWORLD

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* Function library description: ATMEGA8 timer T1 normal mode
* Version: v1.00
* Edited by: Pang Hui, Wuhu Lianda Freescale Studio             									       
* Modified on: August 11, 2011 							   
*			   											   
* Description: 6M external crystal oscillator 10ms timing
*                                                          
* Version update: See readme.txt for details
*
* 20110805 V1.02                                            
*                                                                                          

*Note: LED PC5
/

#include 
#include 

int main(void)
{
    //Set LED to output
    DDRC |= (1 << DDC5);
    
    //6M / 8 * 7500 = 10ms
    TCNT1 = 65535 - 7500;
    //Open timer T1 overflow interrupt
    TIMSK |= (1 << TOIE1);
    //Open the total interrupt
    sei();
    //T1 timer normal mode, 8 division, and start the timer
    TCCR1B |= (1 << CS11);

    while(1);

    return 0;
}  

volatile int i = 0;

SIGNAL(SIG_OVERFLOW1)
{
    i++;
    TCNT1 = 65535 - 7500;
    //LED level inversion

    //When i accumulates to 100, that is 1s
    if(i == 100)
    {
        i = 0;
        PORTC ^= (1 << PC5);
    }
}

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