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.
