Pin Usage
=========

mk20dx128vlf5

 ----
|Keys|
 ----

* Strobe (Columns)

TODO


* Sense (Rows)

PTD1
PTD2
PTD3
PTD4
PTD5
PTD6
PTD7


 ---
|I2C|
 ---

* IS31FL3731C

PTB0  - SCL0 (add header pin, label as SCL0)
PTB1  - SDA0 (add header pin, label as SDA0)
PTB17 - INTB Chip 1
PTB16 - SDB (tied to all Chips, hardware shutdown)


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

* SWD

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

* LEDs

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

* UARTs

PTA1 - RX0
PTA2 - TX0

* Tag Connect

1  - Vdd +5
2  - PTA3 / SWD_IO
3  - Vss / Gnd
4  - PTA0 / SWD_CLK
5  - +5V
6  - PTA2 / TRACE_SWO
7  - N/C
8  - PTA1 / JTAG_TDI
9  - N/C
10 - Reset_b


 ------
|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