Core: ARM 32-bit cortex- M3 CPU
− maximum 72mhz operating frequency
− single cycle multiplication and hardware division storage
− from 64K or 128K bytes of flash program memory
− SRAM up to 20K bytes

Clock, reset and power management
− 2.0 ~ 3.6 V supply and I/O pin
− power on / power off reset (por/pdr), programmable voltage monitor (PVD)
− 4 ~ 16mhz crystal oscillator
− embedded factory adjusted 8MHz RC oscillator
− embedded 40KHz RC oscillator with calibration
− PLL generating CPU clock
− 32kHz RTC oscillator with calibration function

Low power consumption
− sleep, shutdown and standby modes
− V bat supplies power to RTC and backup registers

Two 12 bit analog-to-digital converters with 1US conversion time (up to 16)
− conversion range: 0 to 3.6V
− dual sample and hold function
− temperature sensor

DMA ：
7-channel DMA controller
supported peripherals: timer, ADC, SPI, I2C 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 line commissioning (SWD) and JTAG interface

Up to 7 timers
three 16 bit timers, each with up to four for channel and delta encoder inputs for input capture / output compare /pwm or pulse count one 16 bit PWM advanced control timer with dead band control and emergency braking for motor control
2 Watchdog Timers (independent and window type)
system time timer: 24 bit self decreasing counter

Up to 9 communication interfaces
Up to 2 I2C interfaces (smbus/pmbus support)
Up to 3 USART interfaces (support ISO7816 interface, Lin, IrDA
interface and modulation and demodulation control)

Up to 2 SPI interfaces (18m bit / s)
can interface (2.0B active)
USB 2.0 full speed interface
Lcrc computing unit, 96 bit chip unique code