Atmel SMART R21 ARM-Based Wireless Microcontroller

Product Description

Atmel’s SMART SAM R21 is a series of low-power microcontrollers featuring the 32-bit ARM® Cortex®-M0+ processor and an integrated ultra-low power 2.4GHz ISM band transceiver.

These devices are available in 32- and 48-pin packages with up to 256KB Flash, 32KB of SRAM and a maximum operating frequency of 48MHz and reach 2.14 Coremark/MHz.

SAM R21 is designed for simple and intuitive migration with identical peripheral modules, hex compatible code, identical linear address map and pin compatible migration paths between all devices in the product series. All devices include intelligent and flexible peripherals, Atmel Event System for inter-peripheral signaling, and support for capacitive touch button, slider and wheel user interfaces.

The following features are common to all the SAM R21 devices: In-system programmable Flash, 12-channel direct memory access (DMA) controller, 12-channel Event System, programmable interrupt controller, up to 28 programmable I/O pins, ultra-low power 2.4GHz ISM band transceiver with a data rate of 250kb/s, 32-bit real-time clock and calendar, three 16-bit Timer/Counters (TC) and three 16-bit Timer/Counters for Control (TCC).

The TCs can operate in 8-or 16-bit mode, selected TCs can be cascaded to form a 32-bit TC, and the three Timer/Counters for Control have extended functions optimised for motor, lighting and other control applications.

All devices have accurate and low-power external and internal oscillators, each of which can be used as a source for the system clock.

The SAM R21 devices have two software-selectable sleep modes, idle and standby. In idle mode the CPU is stopped while all other functions can be kept running. In standby all clocks and functions are stopped expect those selected to continue running. The device supports SleepWalking, which is the module's ability to wake itself up and wake up its own clock, and hence perform predefined tasks without waking up the CPU. The CPU can then be only woken on a need basis, e.g. a threshold is crossed or a result is ready.

Each device is supported with a full suite of program and system development tools, including C compilers, macro assemblers, program debugger/simulators, programmers and evaluation kits.