Devices SAMR21 Series SAMR21 Series Microchip Devices 7 ATSAMR21E16A ATSAMR21E Cortex-M0+ ATSAMR21E17A ATSAMR21E Cortex-M0+ ATSAMR21E18A ATSAMR21E Cortex-M0+ ATSAMR21E19A ATSAMR21E Cortex-M0+ ATSAMR21G16A ATSAMR21G Cortex-M0+ ATSAMR21G17A ATSAMR21G Cortex-M0+ ATSAMR21G18A ATSAMR21G Cortex-M0+