topic Re: What is max interrupt frequency for K30 in Kinetis Microcontrollers

What is max interrupt frequency for K30

burakduzgun — Mon, 11 Sep 2017 07:58:08 GMT

For Exp: Can K30 handle about 200kHz(other hand every 5us) PIT interrupt?

Re: What is max interrupt frequency for K30

jingpan — Wed, 13 Sep 2017 07:34:02 GMT

Hi Burak,

K30 PIT clock source is the BUS clock which can be set to the max value 50M. And there is no restriction for PITx_LDVALn. So it can generate interrupt in a very high frequency.

The only problem of high interrupt frequency is whether the MCU has enough time to deal with so much interrupt. If not, interrupt will be pending and then lost.

thanks

Jing

Re: What is max interrupt frequency for K30

egoodii — Wed, 13 Sep 2017 11:38:02 GMT

So thus assuming a 100MHz core-clock, 5us encompasses 500 instruction cycles. ASSUMING a 'couple dozen' clocks are consumed by interrupt hardware processes, that still leaves a 'fair number' of clocks for a 'lean' interrupt handler and 'leftovers' for the rest of the work to be done... 200KHz is certainly 'not unreasonable' to handle.

Re: What is max interrupt frequency for K30

burakduzgun — Thu, 22 Feb 2018 07:12:18 GMT

Thanks for reply