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Description: CPU core: ARM Cortex-M4 CPU maximum main frequency: 180MHz Working voltage range: 1.8V~3.6V Internal oscillator: programmed FLASH capacity: 1MB RAM total capacity: 256KB Number of GPIO ports: 140 ADC (number of units/channels/bits): 1@x24ch /12bit DAC (units/channels/bits): 1@x2ch /12 bit peripheral/function/protocol stack: undervoltage detection/reset; DMA； watchdog; POR； PWM operating temperature range: - 40 ℃~+85 ℃
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