Merge pull request #824 from vtavernier/fix/analog-write-nano33ble

Specify behavior of analogWrite on Nano 33 BLE/BLE Sense

Author: alranel

Language/Functions/Analog IO/analogWrite.adoc

@@ -20,6 +20,7 @@ subCategories: [ "Analog I/O" ]
 Writes an analog value (http://arduino.cc/en/Tutorial/PWM[PWM wave]) to a pin. Can be used to light a LED at varying brightnesses or drive a motor at various speeds. After a call to `analogWrite()`, the pin will generate a steady rectangular wave of the specified duty cycle until the next call to `analogWrite()` (or a call to `digitalRead()` or `digitalWrite()`) on the same pin.
 
 [options="header"]
+
 |=========================================================================================================================
 |=========================================================================================================================
 | Board                                      | PWM Pins +*+                   | PWM Frequency
@@ -33,13 +34,14 @@ Writes an analog value (http://arduino.cc/en/Tutorial/PWM[PWM wave]) to a pin. C
 | MKR1000 WiFi +**+                          | 0 - 8, 10, 11, A3, A4          | 732 Hz
 | Zero +**+                                  | 3 - 13, A0, A1                 | 732 Hz
 | Nano 33 IoT +**+                           | 2, 3, 5, 6, 9 - 12, A2, A3, A5 | 732 Hz
-| Nano 33 BLE/BLE Sense                      | 1 - 13, A0 - A7                | 500 Hz
+| Nano 33 BLE/BLE Sense +****+               | 1 - 13, A0 - A7                | 500 Hz
 | Due +***+                                  | 2-13                           | 1000 Hz
 | 101                                        | 3, 5, 6, 9                     | pins 3 and 9: 490 Hz, pins 5 and 6: 980 Hz
 |=========================================================================================================================
 +*+ These pins are officially supported PWM pins. While some boards have additional pins capable of PWM, using them is recommended only for advanced users that can account for timer availability and potential conflicts with other uses of those pins.  +
 +**+ In addition to PWM capabilities on the pins noted above, the MKR, Nano 33 IoT, and Zero boards have true analog output when using `analogWrite()` on the `DAC0` (`A0`) pin. +
 +***+ In addition to PWM capabilities on the pins noted above, the Due has true analog output when using `analogWrite()` on pins `DAC0` and `DAC1`.
++****+ Only 4 different pins can be used at the same time. Enabling PWM on more than 4 pins will abort the running sketch and require resetting the board to upload a new sketch again. +
 
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