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Merge pull request #21783 from krzysztof-cabaj/nucleo-l0011k4

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boards/nucleo-l011k4: improve board doc
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boards/nucleo-l011k4/doc.md
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The Nucleo-L011K4 is a board from ST's Nucleo family supporting ARM-Cortex-M0+
STM32L011K4 microcontroller with 2KiB of RAM and 16KiB of Flash.
## Flashing the Board Using ST-LINK Removable Media
## Pinout
On-board ST-LINK programmer provides via composite USB device removable media.
Copying the HEX file causes reprogramming of the board. This task
could be performed manually; however, the cpy2remed (copy to removable
media) PROGRAMMER script does this automatically. To program board in
this manner, use the command:
```
make BOARD=nucleo-l011k4 PROGRAMMER=cpy2remed flash
```
@note This PROGRAMMER was tested using ST-LINK firmware 2.37.26. Firmware updates
can be found on [this STM webpage](https://www.st.com/en/development-tools/stsw-link007.html).
@image html pinouts/nucleo-l432kc-and-more.svg "Pinout for the Nucleo-L011K4 (from STM user manual, UM1956, https://www.st.com/resource/en/user_manual/um1956-stm32-nucleo32-boards-mb1180-stmicroelectronics.pdf, page 32)" width=25%
### MCU
| MCU | STM32L011K4 |
|:---------- |:------------------- |
| Family | ARM Cortex-M0+ |
| Vendor | ST Microelectronics |
| RAM | 2KiB |
| Flash | 16KiB |
| Frequency | up to 32MHz |
| FPU | no |
| Timers | 7 (3x 16-bit, 1x RTC, 1x Systick, 2x Watchdog) |
| ADC | 1x 12-bit (10 channels) |
| UARTs | 2 (one USART and one Low-Power UART) |
| SPIs | 1 |
| CANs | 0 |
| RTC | 1 |
| I2Cs | 1 |
| Vcc | 1.65V - 3.6V |
| Datasheet | [Datasheet](https://www.st.com/resource/en/datasheet/stm32l011k4.pdf) |
| Reference Manual | [Reference Manual](https://www.st.com/resource/en/reference_manual/rm0377-ultralowpower-stm32l0x1-advanced-armbased-32bit-mcus-stmicroelectronics.pdf) |
| Programming Manual | [Programming Manual](https://www.st.com/resource/en/programming_manual/pm0223-stm32-cortexm0-mcus-programming-manual-stmicroelectronics.pdf) |
| Board Manual | [Board Manual](https://www.st.com/resource/en/user_manual/um1956-stm32-nucleo32-boards-mb1180-stmicroelectronics.pdf) |
## Flashing the Board
A detailed description about the flashing process can be found on the
[guides page](https://guide.riot-os.org/board_specific/stm32/).
The board name for the Nucleo-L011K4 is `nucleo-l011k4`.