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timer concept for stepper motor

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hiii
i am new with stepper motor .
so i want some basic information related to timer used for stepper motor application in C.

1)when the timer is overflow? and then what will be the next step.

2) i saw some code ther is milli. and micro. delay function both are used WHY ?
Here is the some code ... so plzzz explain me the follwing code bcause i want to be impliment like the same
(IT IS FOR FULL STEPPING )
void Milli_Delay(unsigned int ms)
{
while (ms--)
Micro_Delay(100);
}

void MicroDelay(unsigned int us)
{

us += T1TC;
while (T1TC < us);

}
WHAT IS THE TIMER CONCEPT BEHIND IT TO USED MILLI AND MICRO FUNCTION????
 

Hi,

1. Overflow depend on type of timer, this is mentioned in specifications of the timer; eg- normally if it is 8bit timer it may overflow and trigger interrupt when rollback at 255 to 0;

2. I think MicroDelay(unsigned int us); should be Micro_Delay(unsigned int us); If so,
Milli_Delay is used for larger time of delay, it calls Micro_Delay for several (ms) times. ie. to achieve ms X MicroDelay(100) time delay.

T1TC might be a counter of a running timer. Micro_Delay is for smaller time delay; based on a timer to achieve precise timing. It was only used by Milli_Delay.

Ultimately Milli_Delay will achieve precise time delay need for stepping.

Hope this helps you to understand.
 
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