overflow interrupt??

[gautier]

hello

I use a MC9S12A256B microcontroller with codewarrior.

I use the microcontroller to interface a compactflash card to a Digital analog converter.

My routine turn correctly but I want to timing it.

actually the rythm of the transfert depend of the number of lignes in my program.

I want to regulate it by a software timing.

I want to enter in a interrupt software every 5us, but I don't understand the principe of the overflow timer (I think I must use it to do this regulation).

Can someone help me to do this or guide me to a other solution.

I precise that must using the SCI interface in the same time.

Thanks for your assistance.

Excuse me for spelling mistakes.

[imajeff]

5 uS is very short, so you certainly do not need the overflow interrupt.

After you initialize the interrupt for TC0, you can say such as "TC0 = TC0 + 120". The +120 means to flag 5 uS from last time, assuming the timer prescaler is 0 (default) and the bus freq is 24 MHz