GD32F407VG
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            CoreCortex-M4, 200 MHz 
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            FamilyGD32F4xx Series 
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            Sub-FamilyGD32F407 
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          CMSIS PackGD32F4xx_DFP
GD32F407 - ARM Cortex-M4 Core
          Frequency up to 200 MHz
          Flash access zero wait state
          Single-cycle multiplier and hardware divider
        Memories
          Flash size from 512KB to 3072 KB
          SRAM size is 192 KB with HW parity checking
          30KB ISP loader ROM
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        Features Device GD32F407VG 
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          MemoryIRAM1 128 KiB IRAM2 64 KiB IROM1 1 MiB