..  Copyright (c) 2014-present PlatformIO <contact@platformio.org>
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
       http://www.apache.org/licenses/LICENSE-2.0
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
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``board_build.mcu``
^^^^^^^^^^^^^^^^^^^

Type: ``String`` | Multiple: ``No``

``board_build.mcu`` is a microcontroller(MCU) type that is used by compiler to
recognize MCU architecture. The correct type of ``board_build.mcu`` depends on
platform library. For example, the list of ``board_build.mcu`` for "megaAVR Devices"
is described `here <http://www.nongnu.org/avr-libc/user-manual/>`_.

The full list of ``board_build.mcu`` for the popular embedded platforms you can find
in *Boards* section of :ref:`platforms`. See "Microcontroller" column.
