Wrote new advanced topic

docs/reference/pins/on-pulsed.md

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+# On Pulsed
+
+Configure the specified pin for digital input, and then
+execute the associated code block whenever the pin
+pulses **High** or **Low** (as specified).
+
+```sig
+pins.onPulsed(DigitalPin.P0, PulseValue.High, () => { });
+```
+
+### Parameters
+
+* ``pin``: The micro:bit hardware pin to configure (``P0`` through ``P20``)
+* ``pulsed``: Which state will cause the associated block to execute (**High** or **Low**)
+
+### Example
+
+The following example configures pin ``P2`` for digital input,
+and then displays the string `LOW` whenever ``P2`` pulses low.
+
+```blocks
+pins.onPulsed(DigitalPin.P2, PulseValue.Low, () => {
+    basic.showString("LOW");
+});
+```
+
+### See also
+
+[servo set pulse](/reference/pins/servo-set-pulse),
+[pulse duration](/reference/pins/pulse-duration),
+[digital read pin](/reference/pins/digital-read-pin)