Features: Core: 32-bit Cortex-M0+ CPU, frequency up to 64 MHz. Operating temperature: -40°C to 85°C. Memory: 128 KB protected flash memory; 36 KB SRAM (32 KB with hardware parity). CRC calculation unit. Reset and power management: Voltage range 2.0 V to 3.6 V; Power-on/Power-down reset (POR/PDR); Low-power modes: Sleep, Stop, Standby; VBAT powers the RTC and backup registers. Clock management: 4 to 48 MHz crystal oscillator; Calibrated 32 kHz crystal oscillator; Internal 16 MHz RC with PLL option; Internal 32 kHz RC oscillator (±5%)