FRDM K64 - buffers on I/O

[roymessinger]

Hi,

Regarding the available I/O's on this board, I've noticed there are no buffers on the signal I/O's. I've looked at Arduino R3 (because it can connect to it) but didn't find any buffers over there also. Am I missing something here? 

Because I think it is not a good practice design to neglect the buffers on I/O signals, in case there's some kind of problem.

It seems the I/O's are connected directly from the K64 to Arduino.

Thx.

[kerryzhou]

Hi Roy,

    Do you mean the buffter on I/O is the GPIO buffer?

   The input GPIO buffer is the GPIOx_PDIR, when you receive the data, you can use the code save the GPIO data to elsewhere you want, no matter RAM, FLASH or external flash.

   The ouput GPIO buffer is the same, when you want to send the data, just set the according data in K64 register GPIOx_PDOR.

 Wish it helps you!

If you still have question, please let me know!

Have a great day,
Kerry

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