Description When the main chip STM32F103C8T6 development board is out of the factory each block has written the test program in advance When the power is on the LED light will be uniformly blinking so as to check whether the development board is working properly Specifications Kernel ARM 32 bit Cortex M3 CPU up to 72MHz operating frequency single cycle multiplication and hardware division Memory 64K or 128K bytes of Flash program memory up to 20K bytes of SRAM Clock reset and power management 2 0 to 3 6 V power supply and I O pins power on Power down Reset POR PDR Programmable Voltage Monitor PVD 4 16MHz crystal oscillator built in factory adjusted 8MHz RC oscillator 40 kHz RC oscillator with internal calibration the PLL that generates the CPU clock 32kHz RTC oscillator with calibration function Low power consumption sleep stop and standby modes V BAT powers the RTC and back up registers 2 12 bit analog to digital converters 1us conversion time up to 16 conversion range 0 to 3 6V double sampling and hold function Temperature sensor DMA 7 channel DMA controller Supported peripherals timers ADC SPI I 2 C and USART Up to 80 fast I O ports 26 37 51 80 I O ports all I O ports can be mapped to 16 external interrupts almost all ports can tolerate 5V signals Debug mode Serial single wire debug SWD and JTAG interface Up to 7 timers 3 16 bit timers each timer has up to 4 channels and incremental encode