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Description: CPU core: ARM Cortex-M3 CPU maximum main frequency: 32MHz Working voltage range: 1.8V~3.6V Internal oscillator: programmed FLASH Capacity: 64K@x8bit Total RAM capacity: 32KB EEPROM/data FLASH capacity: 4KB Number of GPIO ports: 51 ADC (units/channels/bits): 1@x20ch /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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