Atmel SAMR21E16A

The Atmel SAMR21E16A is a Core - ARM Cortex-M0+ CPU running at up to 48MHz - Micro Trace Buffer Memories - 64/128/256KB Flash - 16/32KB SRAM System - Power-on reset (POR) and brown-out detection (BOD) - Internal and external clock options with 48MHz Digital Frequency Locked Loop (DFLL48M) - External Interrupt Controller (EIC) - Up to 15 external interrupts - One non-maskable interrupt - Two-pin Serial Wire Debug (SWD) programming, test and debugging interface Low Power - Idle and standby sleep modes - SleepWalking peripherals Peripherals - 12-channel Direct Memory Access Controller (DMAC) - 12-channel Event System - Integrated Ultra Low Power Transceiver for 2.4GHz ISM Band - Three 16-bit Timer/Counters (TC), configurable as either: One 16-bit TC with compare/capture channels One 8-bit TC with compare/capture channels One 32-bit TC with compare/capture channels, by using two TCs - Three 16-bit Timer/Counters for Control (TCC), with extended functions: 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 - 32-bit Real Time Counter (RTC) with clock/calendar function - Watchdog Timer (WDT) - CRC-32 generator - One full-speed (12Mbps) Universal Serial Bus (USB) 2.0 interface - Up to five Serial Communication Interfaces (SERCOM), each configurable to operate as either: USART, I2C, SPI, LIN slave - One 12-bit, 350ksps Analog-to-Digital Converter (ADC) with up to eight external channels - Two Analog Comparators (AC) with window compare function - Peripheral Touch Controller (PTC) I/O and Package - 16/28 programmable I/O pins - 32-pin and 48-pin QFN.