[Doc] Tidy up compatible MCUs docs (#7295)
* Tidy up compatible MCUs docs * ARM chips should have USB * 32KB soft lower limit applies to ARM as well * NXP is the manufacturer name, not Kinetis * Units
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* [Keymap Overview](keymap.md)
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* [Hardware](hardware.md)
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* [Compatible Microcontrollers](compatible_microcontrollers.md)
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* [AVR Processors](hardware_avr.md)
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* [Drivers](hardware_drivers.md)
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# Atmel AVR
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# Compatible Microcontrollers
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QMK should run on any Atmel AVR processor with enough Flash. It has been tested on the following:
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QMK runs on any USB-capable AVR or ARM microcontroller with enough flash space - generally 32kB or more, though it will *just* squeeze into 16kB with most features disabled.
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* ATmega32U4 ([PJRC Teensy 2.0](http://www.pjrc.com/teensy/))
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* AT90USB1286 ([PJRC Teensy++ 2.0](http://www.pjrc.com/teensy/))
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* AT90USB1287 ([Atmel USBKEY](http://www.atmel.com/tools/AT90USBKEY.aspx))
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* ATmega168P with using [V-USB](http://www.obdev.at/products/vusb/index.html)
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* ATmega328P with using [V-USB](http://www.obdev.at/products/vusb/index.html)
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* ATmega32U2
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* AT90USB1286, 646, 647 should work
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* AT90USB162 testing...
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## Atmel AVR
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NOTE: To enable full features of firmware you'll need 32KB flash size.
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The following use [LUFA](https://www.fourwalledcubicle.com/LUFA.php) as the USB stack:
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Please add any tested microcontrollers to this list.
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* [ATmega16U2](https://www.microchip.com/wwwproducts/en/ATmega16U2) / [ATmega32U2](https://www.microchip.com/wwwproducts/en/ATmega32U2)
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* [ATmega16U4](https://www.microchip.com/wwwproducts/en/ATmega16U4) / [ATmega32U4](https://www.microchip.com/wwwproducts/en/ATmega32U4)
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* [AT90USB64](https://www.microchip.com/wwwproducts/en/AT90USB646) / [AT90USB128](https://www.microchip.com/wwwproducts/en/AT90USB1286)
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# ARM
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Certain MCUs which do not have native USB will use [V-USB](https://www.obdev.at/products/vusb/index.html) instead:
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You can also use any ARM processor that [ChibiOS](http://www.chibios.org) supports. The following processors have been tested:
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* [ATmega32A](https://www.microchip.com/wwwproducts/en/ATmega32A)
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* [ATmega328P](https://www.microchip.com/wwwproducts/en/ATmega328P)
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* [Kinetis MKL26Z64](http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/kinetis-cortex-m-mcus/l-series-ultra-low-power-m0-plus/kinetis-kl2x-48-mhz-usb-ultra-low-power-microcontrollers-mcus-based-on-arm-cortex-m0-plus-core:KL2x)
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* [Kinetis MK20DX128](http://www.nxp.com/assets/documents/data/en/data-sheets/K20P64M50SF0.pdf)
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* [Kinetis MK20DX128](http://www.nxp.com/assets/documents/data/en/data-sheets/K20P64M50SF0.pdf)
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* [Kinetis MK20DX256](http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/kinetis-cortex-m-mcus/k-series-performance-m4/k2x-usb/kinetis-k20-72-mhz-full-speed-usb-mixed-signal-integration-microcontrollers-mcus-based-on-arm-cortex-m4-core:K20_72)
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## ARM
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You can also use any ARM chip with USB that [ChibiOS](http://www.chibios.org) supports. Most have plenty of flash. Known to work are:
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### STMicroelectronics (STM32)
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* [STM32F0x2](https://www.st.com/en/microcontrollers-microprocessors/stm32f0x2.html)
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* [STM32F103](https://www.st.com/en/microcontrollers-microprocessors/stm32f103.html)
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* [STM32F303](https://www.st.com/en/microcontrollers-microprocessors/stm32f303.html)
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### NXP (Kinetis)
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* [MKL26Z64](https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/kl-series-cortex-m0-plus/kinetis-kl2x-72-96-mhz-usb-ultra-low-power-microcontrollers-mcus-based-on-arm-cortex-m0-plus-core:KL2x)
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* [MK20DX128](https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/k-series-cortex-m4/k2x-usb/kinetis-k20-50-mhz-full-speed-usb-mixed-signal-integration-microcontrollers-based-on-arm-cortex-m4-core:K20_50)
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* [MK20DX256](https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/k-series-cortex-m4/k2x-usb/kinetis-k20-72-mhz-full-speed-usb-mixed-signal-integration-microcontrollers-mcus-based-on-arm-cortex-m4-core:K20_72)
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## Atmel ATSAM
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There is limited support for one of Atmel's ATSAM microcontrollers, that being the [ATSAMD51J18A](https://www.microchip.com/wwwproducts/en/ATSAMD51J18A) used by the [Massdrop keyboards](https://github.com/qmk/qmk_firmware/tree/master/keyboards/massdrop).
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