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about crystal frequency and delay in AVR

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mvgohil

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How can i calculate delay in atmega8 or 16 ? Is controller divide crystal by something or what ?

what is the machine cycle for different instruction?
 

Most of the compilers have built in delay routines. You can use that

By the what compiler you are using?
 

Avr studio is not a compiler, but maybe you are using win-avr?
Try including <util/delay.h>
there should be a function called _delay_ms()
 

@oyvdahl

yes there is a header file but in hard ware i should connect how much Mhz crystal for its compatibility.?
 

mvgohil said:
@oyvdahl

yes there is a header file but in hard ware i should connect how much Mhz crystal for its compatibility.?
Click to expand...

You have to define the crystal frequency like this (For example your crystal freq. is 1MHz)
#define F_CPU 1000000UL
after that you should add
#include <util/delay.h>
 

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