Unused Pins

[davidzhou]

Hi,

I have K60 tower:  MK60FN1M0VLQ12.

I have general questions about unused pins.

1. What is the state of uninitialized pins? Tri-state, Input, or output?

2. What is your suggestions to initialize unused pins if it is necessary to to be initialized?

    as disabled (analog)  - MUX (0)

    as GPIO - MUX (1)  as input pull-up, pull-down, or output?

3. is disabled (analog) - MUX(0) the same as tri-state?

Thank you,

David Zhou

[danielchen · Accepted solution]

Hi David:

1 ) With the exception of the JTAG pins, during reset the digital IO pins go to a disabled (high impedance) state with internal pullups/pulldowns disabled. Pin with analog functionality will default to their analog functions.

2)  Please check the below picture for details

3 ) not understand you , could you clarify it ?

Regards

Daniel

[davidzhou]

Hi Daniel,

Thank you for your answers. The third question is  (from K60 reference Page 301):

with MUX(000) pin mux control selection. I think you have already answered in the first question: GPIO pins are disabled and analog pins as analog floating.

Thank you,

David Zhou