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Description: CPU core: ARM Cortex-M3 CPU maximum main frequency: 72MHz Working voltage range: 2V~3.6V Internal oscillator: programmed FLASH Capacity: 256K@x8bit Total RAM capacity: 64KB Number of GPIO ports: 51 ADC (units/channels/bits): 1@x16ch /12bit DAC (units/channels/bits): 1@x2ch /12bit peripheral/function/protocol stack: DMA; Voltage detection; watchdog; POR； PWM operating temperature range: - 40 ℃~+85 ℃ STM32 Series 256 KB Flash 64 KB SRAM 32 Bit Microcontroller - LQFP-64
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