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boards: nucleo-f446ze: Cleanup documentation

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Signed-off-by: Francois Berder <18538310+francois-berder@users.noreply.github.com>
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boards/nucleo-f446ze/doc.txt
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## Overview
The Nucleo-F446 is a board from ST's Nucleo family supporting a ARM Cortex-M4
STM32F446RE microcontroller with 128Kb of RAM and 512Kb of ROM Flash.
The Nucleo-F446ZE is a board from ST's Nucleo family supporting a ARM Cortex-M4
STM32F446ZE microcontroller with 128Kb of RAM and 512Kb of ROM Flash.
## Hardware
![Nucleo64 F446](http://www.open-electronics.org/wp-
content/uploads/2015/08/Figura2-500x467.png)
![Nucleo144 F446ZE](https://raw.githubusercontent.com/wiki/RIOT-OS/RIOT/images/nucleo144-board.png)
### MCU
| MCU | STM32F446RE |
|:------------- |:--------------------- |
| Family | ARM Cortex-M4 |
| Vendor | ST Microelectronics |
| RAM | 128Kb |
| MCU | STM32F446ZE |
|:---------- |:----------------- |
| Family | ARM Cortex-M4 |
| Vendor | ST Microelectronics |
| RAM | 128Kb |
| Flash | 512Kb |
| Frequency | up to 180MHz |
| Frequency | up to 180MHz |
| FPU | yes |
| Timers | 11 (2x watchdog, 1 SysTick, 12x 16-bit, 2x 32-bit [TIM2]) |
| ADCs | 3x 12-bit |
| UARTs | 4 |
| Timers | 17 (2x watchdog, 1 SysTick, 12x 16-bit, 2x 32-bit [TIM2]) |
| ADCs | 3x 12-bit (24 channels) |
| UARTs | 6 |
| SPIs | 4 |
| I2Cs | 4 |
| RTC | 1 |
| Vcc | 2.0V - 3.6V |
| Datasheet | [Datasheet](http://www.st.com/resource/en/datasheet/stm32f446re.pdf) |
| Reference Manual | [Reference Manual](http://www.st.com/web/en/resource/technical/document/reference_manual/DM00031936.pdf) |
| Programming Manual | [Programming Manual](http://www.st.com/web/en/resource/technical/document/programming_manual/DM00051352.pdf) |
| Board Manual | [Board Manual](http://www.st.com/st-web-ui/static/active/en/resource/technical/document/user_manual/DM00105823.pdf)|
| CAN | 2 |
| USB | 1 |
| Vcc | 1.8V - 3.6V |
| Datasheet | [Datasheet](http://www.st.com/resource/en/datasheet/stm32f446ze.pdf) |
| Reference Manual | [Reference Manual](https://www.st.com/resource/en/reference_manual/dm00135183.pdf) |
| Programming Manual | [Programming Manual](https://www.st.com/resource/en/programming_manual/dm00046982.pdf) |
| Board Manual | [Board Manual](https://www.st.com/resource/en/user_manual/dm00244518.pdf)|
## Implementation Status
| Device | ID | Supported | Comments |
|:------------- |:------------- |:------------- |:------------- |
| MCU | STM32F446RE | partly | Energy saving modes not fully utilized |
| MCU | STM32F446ZE | partly | Energy saving modes not fully utilized |
| Low-level driver | GPIO | yes | |
| | PWM | yes (9 pins available) | |
| | UART | 3 UARTs | USART2 via STLink/USB or D0(RX)/D1(TX), USART3 on PC11(RX)/PC10(TX) and USART1 on PA10(RX)/PA9(TX) |
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## Flashing the device
The ST Nucleo-F446RE board includes an on-board ST-LINK V2 programmer. The
The ST Nucleo-F446ZE board includes an on-board ST-LINK V2 programmer. The
easiest way to program the board is to use OpenOCD. Once you have installed
OpenOCD (look [here](https://github.com/RIOT-OS/RIOT/wiki/OpenOCD) for
installation instructions), you can flash the board simply by typing
```
make BOARD=nucleo-f446 flash
make BOARD=nucleo-f446ze flash
```
and debug via GDB by simply typing
```
make BOARD=nucleo-f446 debug
make BOARD=nucleo-f446ze debug
```
## Supported Toolchains
For using the ST Nucleo-F446RE board we strongly recommend the usage of the
For using the ST Nucleo-F446ZE board we strongly recommend the usage of the
[GNU Tools for ARM Embedded Processors](https://launchpad.net/gcc-arm-
embedded)
toolchain.