Feature Model STM32F103C8T6Kernel ARM32 bit Cortex M3CPUSize 22 86mm x 53 34mm Debug Mode SWD MCU Introduction 1 The maximum operating frequency of 72MHz2 Single cycle multiply and hardware divide3 64k Flash program memory4 20k bytes SRAM5 2 0 3 6V power supply and I O pins6 On power up power reset POR PDR programmable voltage monitor7 4 16MHz crystal oscillator8 Embedded 8MHz RC oscillator9 generates CPU clock PLL10 Sleep Stop Standby mode11 VBAT power for the RTC back registers12 37 Quick I O ports the I O ports can be mapped to 16 external interrupts etc Package included 3 x STM32F103C8T6 Small System Board Microcontroller STM32 ARM Core Board For3 x Pin