The Microchip ATSAMD21E17 low-power microcontroller with 32-bit ARM Cortex processor has 128KB Flash and 16KB of SRAM. It operates on voltage range of 1.62V to 3.63V. This microcontroller is designed for simple and intuitive migration with identical peripheral modules, hex compatible code, identical linear address map, and pin compatible migration paths. It features In-system programmable Flash, 12-channel Direct Memory Access Controller (DMAC), 12-channel Event System, programmable Interrupt Controller, up to 52 programmable I/O pins, 32-bit Real-Time Clock and Calendar (RTC), up to five 16-bit Timer/Counters (TC) and up to four 24-bit Timer/Counters for Control (TCC), where each TC can be configured to perform frequency and waveform generation, accurate program execution timing or input capture with time and frequency measurement of digital signals.

External Interrupt Controller (EIC)
Two-pin Serial Wire Debug (SWD) programming, test and debugging interface
Idle and Standby Sleep modes
Sleepwalking peripherals
Up to four compare channels with optional complementary output
Generation of synchronized pulse width modulation (PWM) pattern across port pins
Deterministic fault protection, fast decay and configurable dead-time between complementary output
Dithering that increase resolution with up to 5 bit and reduce quantization error
Up to eight PWM channels on each 24-bit TCC
Up to two PWM channels on each 16-bit TCC
Up to two PWM channels on each 16-bit TC
32-bit Real Time Counter (RTC) with clock/calendar function
One full-speed (12 Mbps) Universal Serial Bus (USB) 2.0 interface
Up to four Analog Comparators (AC) with Window Compare function
Temperature range between -40°C and 125°C
QFN package