1 files changed, 55 insertions, 0 deletions
diff --git a/docs/source/lang/api/highbyte.rst b/docs/source/lang/api/highbyte.rst
new file mode 100644
index 0000000..4cb6f9b
--- /dev/null
+++ b/docs/source/lang/api/highbyte.rst
@@ -0,0 +1,55 @@
+.. highlight:: cpp
+
+.. _lang-highbyte:
+
+highByte()
+==========
+
+(Macro) Extracts the second lowest byte of an integral data type.
+
+.. warning:: This macro is provided for compatibility with Arduino
+   only.  It returns the second-least significant byte in an integral
+   value.  It makes sense to call this the "high" byte on a 16-bit
+   ``int`` microcontroller like the Atmel chips on Arduinos, but it
+   makes no sense at all on a 32-bit microcontroller like the STM32s
+   in the Maple line.
+
+   In short: we provide this so that existing Arduino code works as
+   expected, but **strongly discourage its use** in new programs.
+
+Syntax
+------
+
+::
+
+  highByte(x)
+
+Parameters
+----------
+
+**x**: a value of any integral type.
+
+Returns
+-------
+
+Second lowest byte in **x**.
+
+Example
+-------
+
+::
+
+    int x = 0xDEADBEEF;
+    SerialUSB.println(x, HEX); // prints "BE"
+
+Arduino Compatibility
+---------------------
+
+The Maple version of ``highByte()`` is compatible with Arduino.
+
+See Also
+--------
+
+-  :ref:`lowByte() <lang-lowbyte>`
+
+.. include:: /arduino-cc-attribution.txt