Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Problem about interval timer

Hi guys now i want to use the interval timer as interrupt to send a 40khz sine wave to i/o port.but when i set the interval timer as 1us which equals the sampling frequecy of ad5547(1mhz),it does'...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

With a clock of 20 MHz, that means only 20 cycles between the interrupt. I think this is not sufficient for the processor to make all the stuff it has to do (call of the interrupt service routine, make the job, and go back). You can verify this by simulation.

Can you use a higher frequency ?

Jérôme