ATSAMD21G18 : 32 bit MCU

You are currently viewing ATSAMD21G18 : 32 bit MCU
  • Post author:
  • Reading time:3 mins read

A low-power, high-performance Microchip’s ARM® Cortex®-M0+ based flash microcontroller, the ATSAMD21G18 is ideal for a wide range of home automation, consumer, metering, and industrial applications.

Features :

  • 256KB of flash and 32KB of SRAM
  • Up to 48MHz operating frequency
  • Six serial communication modules (SERCOM) configurable as UART/USART, SPI or I2C, three 16-bit timer/counters, 32-bit Real-Time Clock and calendar, 20 PWM channels, one 14-channel 12-bit ADC, one 10-bit DAC
  • Full Speed USB Device and embedded Host
  • Support for up to 120 touch channels
  • 1.62V to 3.63V power supply
  • Easy pin migration to SAMD21G and SAMD21J devices

  • ARM Cortex-M0+ CPU running at up to 48MHz
    • Single-cycle hardware multiplier
    • Micro Trace Buffer
  • 256KB in-system self-programmable Flash
  • 32KB SRAM Memory
  • Power-on reset (POR) and brown-out detection (BOD)
  • Internal and external clock options with 48MHDigital Frequency Locked Loop (DFLL48M) and 48MHto 96MHFractional
  • External Interrupt Controller (EIC)
  • 16 external interrupts
  • One non-maskable interrupt
  • Two-pin Serial Wire Debug (SWD) programming, test and debugging interface
  • Drop in compatible with SAM D20
  • Idle and standby sleep modes
  • SleepWalking peripherals
  • 12-channel Direct Memory Access Controller (DMAC)
  • 12-channel Event System
  • Up to five 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  24-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
    • Embedded device function
    • Eight endpoints
  • Six Serial Communication Interfaces (SERCOM), each configurable to operate as either:
    • USART with full-duplex and single-wire half-duplex configuration
    • I2C Bus up to 3.4MHz
    • SPI
    • LIN slave
  • 12-bit, 350ksps Analog-to-Digital Converter (ADC) with up to 14 channels
    • Differential and single-ended input
    • 1/2x to 16x programmable gain stage
    • Automatic offset and gain error compensation
    • Oversampling and decimation in hardware to support 13-, 14-, 15- or 16-bit resolution
  • 10-bit, 350ksps Digital-to-Analog Converter (DAC)
  • Two Analog Comparators (AC) with window compare function
  • Peripheral Touch Controller (PTC)
    • 256-channel capacitive touch and proximity sensing
  • 38 GPIO pins
  • 48-pin TQFP, QFN, WLCSP
  • 1.62V – 3.63V

Integrated Development Environment:

MPLAB X Integrated Development Environment (IDE) ( MPLAB-X-IDE )

Atmel Studio IDE ( Atmel-Studio )

Farees Ahmed

The aim of this blog is to serve as a quick reference guide for the Curious. Appreciate your feedback and comments !