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Description: CPU core: ARM Cortex-M4 CPU maximum main frequency: 170MHz Working voltage range: 1.71V~3.6V Internal oscillator: programmed FLASH Capacity: 512K@x8bit Total RAM capacity: 128KB Number of GPIO ports: 42 ADC (units/channels/bits): 1@x21ch /12bit DAC (units/channels/bits): 1@x4ch /12 bit peripheral/function/protocol stack: undervoltage detection/reset; DMA； watchdog; POR； PWM operating temperature range: - 40 ℃~+85 ℃
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