The ATSAMR21G18A-MU is a 32-bit SMART ARM-based Wireless Microcontroller with 256kB flash and 32kB SRAM memory. IEEE 802.15.4 compliant single chip combines an ARM® Cortex®-M0+ based 32-bit microcontroller and best-in-class 2.4GHz RF transceiver. It offers an excellent RF performance, with a link budget of 103dBm while consuming 50% less active current than existing offerings. The device features IEEE 802.15.4 MAC hardware accelerators and automatic transmission modes, wake-on-radio, offers twelve-channel direct memory access (DMA) controller, up to four configurable SERCOM modules for I²C, SPI and USART and a 128-bit AES crypto engine. The device features further blocks like a Peripheral Touch Controller (PTC), Full-Speed USB Device and embedded Host and hardware components to support RF distance measurements. To complement that set the SAM R21 also supports external power amplifiers and antenna diversity.
ARM Cortex-M0+ CPU running at up to 48MHz
Internal and external clock options
Digital phase locked loop (FDPLL96M)
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
Peripherals - 12-channel Direct Memory Access Controller (DMAC)
