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Description: CPU core: ARM Cortex-M4 CPU maximum main frequency: 84MHz Working voltage range: 1.7V~3.6V Internal oscillator: programmed FLASH Capacity: 256K@x8bit Total RAM capacity: 64KB Number of GPIO ports: 81 ADC (units/channels/bits): 1@x16ch /12 bit peripheral/function/protocol stack: undervoltage detection/reset; DMA； watchdog; POR； PWM operating temperature range: - 40 ℃~+85 ℃
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