Product Features 32-bit Arm Cortex-M3 core Maximum 96MHz operating frequency Flash: 64KB SRAM: 20KB HSECLK: Supports 4~16MHz external crystal/ceramic oscillator LSECLK: Supports 32.768KHz crystal/ceramic oscillator HSICLK: Factory-calibrated 8MHz RC oscillator LSICLK: Supports 40KHz RC oscillator PLL: Phase-locked loop, supports 2~16x frequency multiplication VDD range: 2.0~3.6V VDDA range: 2.0~3.6V Backup domain power VBAT range: 1.8V~3.6V Supports Power-On Reset/Power-Down Reset (POR/PDR) Supports programmable voltage detector Supports three modes: Sleep, Stop, and Standby 1 7-channel DMA JTAG debug interface SWD debug interface Up to 51 I/Os All I/Os can be mapped to external interrupt vectors Up to 29 5V-tolerant I/Os 2 I2C interfaces (1Mbit/s), supporting SMBus/PMBus 3 USARTs, supporting ISO7816, LIN, and IrDA functions 2 SPIs, maximum transmission speed 18Mbps 1 CAN 1 USBD 2 12-bit ADCs 1 16-bit advanced timer TMR1 providing 7-channel PWM output, supporting dead-time generation and brake input functions 3 16-bit general-purpose timers TMR2/3/4, each timer has 4 independent channels for input capture, output compare, PWM, and pulse counting functions 2 watchdog timers: one independent watchdog IWDT and one window watchdog WWDT 1 24-bit down-counting system timer Sys Tick Timer RTC supports calendar function 84 Bytes backup registers CRC calculation unit 96-bit device ID