Atmel / Microchip R21 SMART基于ARM的无线微控制器

Microchip R21 SMART基于ARM的无线微控制器是配有32位ARM® Cortex®-M0+处理器的低功耗器件，集成了2.4GHz ISM频段收发器。 R21器件采用32引脚和48引脚封装，设有高达256KB的闪存、32KB的SRAM，最高工作频率为48MHz，并可达到2.46 CoreMark/MHz。 R21设计用于简单直观的迁移，具有相同的外设模块、十六进制兼容代码、相同的线性地址映射，以及与引脚兼容的迁移路径。所有器件均包含智能和灵活外设、Atmel事件系统，用于外设之间的信号传输以及为电容式触控按钮、滑块和滚轮用户界面提供支持。

特性

Processor
- ARM Cortex-M0+ CPU running at up to 48MHz
- Single-cycle hardware multiplier
- Micro Trace Buffer (MTB)
Memories
- 768/256/128/64KB in-system self-programmable Flash
- 32/16/8KB SRAM
System
- Power-on reset (POR) and brown-out detection (BOD)
- Internal and external clock options with 48MHz Digital Frequency Locked Loop (DFLL48M) and 48MHz to 96MHz Fractional 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
- SleepWalking peripherals
I/O and Package
- 16/28 programmable I/O pins
- 32-pin and 48-pin QFN

Operating Voltage
- 1.8V - 3.6V
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:
- Three 16-bit Timer/Counters for Control (TCC), with extended functions:
- 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:
- 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)