ATSAMD21G18A
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            CoreCortex-M0+, 48 MHz 
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            FamilySAMD21 
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          CMSIS PackSAMD21_DFP
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        Features Device ATSAMD21G18A 
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          MemoryFLASH 256 KiB HMCRAMC0 32 KiB HPB0 64 KiB HPB1 64 KiB HPB2 64 KiB PERIPHERALS 512 MiB PPB 1 MiB SCS 4 KiB