The STM32F21x family is based on the high-performance ARM Cortex-M3 32-bit RISC core operating at a frequency of up to 120 MHz. The family incorporates high-speed embedded memories (Flash memory up to 1 Mbyte, up to 128 Kbytes of system SRAM), up to 4 Kbytes of backup SRAM, and an extensive range of enhanced I/Os and peripherals connected to two APB buses, three AHB buses and a 32-bit multi-AHB bus matrix.The devices also feature an adaptive real-time memory accelerator (ART Accelerator) which allows to achieve a performance equivalent to 0 wait state program execution from Flash memory at a CPU frequency up to 120 MHz. This performance has been validated using the CoreMark benchmark.All devices offer three 12-bit ADCs, two DACs, a low-power RTC, twelve general-purpose 16-bit timers including two PWM timers for motor control, two general-purpose 32-bit timers. a true number random generator (RNG). They also feature standard and advanced communication interfaces. New advanced peripherals include an SDIO, an enhanced flexible static memory control (FSMC) interface (for devices offered in packages of 100 pins and more), a cryptographic acceleration cell, and a camera interface for CMOS sensors. The devices also feature standard peripherals.Core: ARM 32-bit Cortex™-M3 CPU (120 MHz max) with Adaptive real-time accelerator (ART Accelerator™ allowing 0-wait state execution performance from Flash memory, MPU, 150 DMIPS/1.25 DMIPS/MHz (Dhrystone 2.1)MemoriesUp to 1 Mbyte of Flash memory512 bytes of OTP memoryUp to 128 + 4 Kbytes of SRAMFlexible static memory controller that supports Compact Flash, SRAM, PSRAM, NOR and NAND memoriesLCD parallel interface, 8080/6800 modesClock, reset and supply managementFrom 1.8 to 3.6 V application supply+I/OsPOR, PDR, PVD and BOR4 to 26 MHz crystal oscillatorInternal 16 MHz factory-trimmed RC32 kHz oscillator for RTC with calibrationInternal 32 kHz RC with calibrationLow powerSleep, Stop and Standby modesVBATsupply for RTC, 20 × 32 bit backup registers, and optional 4 KB backup SRAM3 × 12-bit, 0.5 µs ADCs with up to