Pin Usage
=========

mk20dx128vlf5

 ----
|Keys|
 ----

* Strobe (Columns)

PTB0
PTB1
PTB2
PTB3
PTB16
PTB17
PTC4
PTC5
PTD0


* Sense (Rows)

PTD1
PTD2
PTD3
PTD4
PTD5
PTD6
PTD7


 -----
|Debug|
 -----

* SWD

PTA0 (Pull-down)
PTA3 (Pull-up)

* LEDs

PTA19 (LED only for PCB, not McHCK) (XTAL)

* UARTs

PTA1 - RX0
PTA2 - TX0


 ------
|Unused|
 ------

* GPIO

PTA1 (Not broken out on PCB, available on McHCK) (Pull-up)
PTA2 (")
PTA4 (Pull-up)
PTA18 (EXTAL)

PTC0
PTC1
PTC2
PTC3
PTC6
PTC7

* Analog

ADC0_DP0
ADC0_DM0