/**
 * @defgroup        cpu_samd21 Atmel SAMD10/SAMD20/SAMD21/SAMR21
 * @ingroup         cpu
 * @brief           Atmel SAMD1x/SAMD2x Cortex-M0+ MCU specific implementation.
 *
 * This module contains Atmel SAMD10/SAMD20/SAMD21/SAMR21 specific code and definition.
 *
 * @see cpu_sam0_common
 */