An experiment -- Fast GPIO vs normal GPIO

Showing results for 
Search instead for 
Did you mean: 

An experiment -- Fast GPIO vs normal GPIO

No ratings

An experiment -- Fast GPIO vs normal GPIO

Hi team ,

     I would like to share an experiment that about the Fast IO - zero wait state access of KL series . Detail please refer to attached file .

Best regards,


Tags (1)

I have done some experimenting on FRDM-KL02Z32 and have problems with FGPIO switching performance with Bus Clock 4 MHz and below.

The 8MHz Bus Clock works normal 125 ns cycle per FGPIO switch, but with 4 Mhz Bus Clock, I get unstable switching from 250 ns to 500 ns.

To me it looks like System Clock and Bus Clock have synchronization problems.

I checked with FEI and 24 MHz divided down to Bus Clock  and also with IRC 4 MHz directly to Bus Clock in FBI mode same result.

Can someone recheck or explain?

Version history
Revision #:
1 of 1
Last update:
‎12-10-2015 09:29 AM
Updated by: