STM32F401CBYx
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            CoreCortex-M4, 84 MHz 
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            FamilySTM32F4 Series 
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            Sub-FamilySTM32F401 
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          CMSIS PackSTM32F4xx_DFP
High-performance STM32F4 MCUs with Arm Cortex-M4 core, MPU, DSP, FPU, 225 DMIPS at 180MHz.
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        Features Device STM32F401CBYx 
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          MemoryFlash 128 KiB SRAM 64 KiB