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controller/Scan/MD2/pinout

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Pin Usage
=========
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mk20dx256vlh7
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----
|Keys|
----
* Strobe (Columns)
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TODO
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* Sense (Rows)
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TODO
-----
|Clock|
-----
PTA18 <-> PTA19
---
|I2C|
---
* Main - Connect to all ISSI Chips - Also break out header for debugging
PTB0 - SCL0
PTB1 - SDA0
* Reserve - Might be used later if I2C bus is too slow with more than 1 ISSI chip
PTE0 - SDA1
PTE1 - SCL1
* ISSI Control (enough pins for 3 chips reserved)
PTC0 - INTB Chip 1
PTC1 - INTB Chip 2
PTC2 - INTB Chip 3 (Only needed if more than 96 RGB LEDs are required)
PTA4 - SDB (tied to tall Chips, hardware shutdown)
---
|DAC|
---
DAC0 (N/C)
----
|UART|
----
* Comm - Will be used on split keyboards
PTC3 - RX1 (N/C)
PTC4 - TX1 (N/C)
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-----
|Debug|
-----
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* SWD - (Main reflash header)
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PTA0 (Pull-down)
PTA3 (Pull-up)
* LEDs
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PTA5 (LED only for PCB, not Teensy)
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* UARTs
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PTA1 - RX0 (UART Debug Header)
PTA2 - TX0 (UART Debug Header)
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------
|Unused|
------
* GPIO
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PTA12
PTA13
PTB2
PTB3
PTB16
PTB17
PTB18
PTB19
PTC5
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PTC6
PTC7
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PTC8
PTC9
PTC10
PTC11
PTD0
PTD1
PTD2
PTD3
PTD4
PTD5
PTD6
PTD7
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* Analog
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TODO
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