Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO 数据表

 Atmel-42181C–SAM-D21_Datasheet–07/2014

The Atmel

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 | SMART

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 SAM D21 is a series of low-power microcontrollers using the 32-bit 

ARM

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Cortex

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-M0+ processor, and ranging from 32- to 64-pins with up to 256KB Flash and 

32KB of SRAM. The SAM D21 devices operate at a maximum frequency of 48MHz and reach 
2.14 Coremark/MHz. They are 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 Atmel SAM D21 devices provide the following features: In-system programmable Flash, 
twelve-channel direct memory access (DMA) controller, 12 channel Event System, 
programmable interrupt controller, up to 52 programmable I/O pins, 32-bit real-time clock and 
calendar, up to five 16-bit Timer/Counters (TC) and three 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. The TCs can operate in 8- or 16-bit mode, selected TCs can be cascaded to form 
a 32-bit TC, and three timer/counters have extended functions optimized for motor, lighting and 
other control applications. The series provide one full-speed USB 2.0 embedded host and device 
interface; up to six Serial Communication Modules (SERCOM) that each can be configured to act 
as an USART, UART, SPI, I

2

C up to 3.4MHz, SMBus, PMBus, and LIN slave; two-channel I

2

S 

interface; up to twenty-channel 350ksps 12-bit ADC with programmable gain and optional 
oversampling and decimation supporting up to 16-bit resolution, one 10-bit 350ksps DAC, two 
analog comparators with window mode, Peripheral Touch Controller supporting up to 256 
buttons, sliders, wheels and proximity sensing; programmable Watchdog Timer, brown-out 
detector and power-on reset and two-pin Serial Wire Debug (SWD) program and debug interface.

All devices have accurate and low-power external and internal oscillators. All oscillators can be 
used as a source for the system clock. Different clock domains can be independently configured 
to run at different frequencies, enabling power saving by running each peripheral at its optimal 
clock frequency, and thus maintaining a high CPU frequency while reducing power consumption.

The SAM D21 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. This feature allows the peripheral to wake up from sleep based on predefined 
conditions, and thus allows the CPU to wake up only when needed, e.g. when a threshold is 
crossed or a result is ready. The Event System supports synchronous and asynchronous events, 
allowing peripherals to receive, react to and send events even in standby mode.

The Flash program memory can be reprogrammed in-system through the SWD interface. The 
same interface can be used for non-intrusive on-chip debug of application code. A boot loader 
running in the device can use any communication interface to download and upgrade the 
application program in the Flash memory.
The Atmel SAM D21 devices are supported with a full suite of program and system development 
tools, including C compilers, macro assemblers, program debugger/simulators, programmers and 
evaluation kits

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