Microchip Technology SAM3U Arm® Cortex®-M3 Flash-Based Microcontrollers

Microchip Technology SAM3U Arm® Cortex®-M3 Flash-Based Microcontrollers are Arm Cortex-M3 Flash Microcontrollers with on-chip high-speed USB Device-and-Transceiver, SDIO/SDCard/MMC, and SPI interfaces. This connectivity, together with the SAM3U's 96MHz/ 1.25 DMIPS/MHz operating frequency, makes the SAM3U the unique Cortex M3 device suited to applications with intensive communications requirements, such as high-speed gateways in industrial, medical, data processing, and consumer applications. For rapid evaluation and code development, industry-leading third parties provide a full range of development tools, RTOS, middleware, and support services to reduce time-to-market to a minimum.


  • Arm® Cortex®-M3 revision 2.0 Core running at up to 96MHz
  • Memories
    • 16kb ROM with embedded bootloader routines (UART, USB) and IAP routines
    • Static Memory Controller (SMC): SRAM, NOR, NAND support. NAND Flash controller with 4kb RAM buffer and ECC
  • System
    • Embedded voltage regulator for single-supply operation
    • POR, BOD, and Watchdog for safe reset
    • Quartz or resonator oscillators: 3MHz to 20MHz main and optional low power 32.768kHz for RTC or device clock
    • High precision 8MHz /12MHz factory trimmed internal RC oscillator with 4MHz Default Frequency for fast device startup
    • Slow Clock Internal RC oscillator as permanent clock for device clock in low power mode
    • One PLL for device clock and one dedicated PLL for USB 2.0 High-Speed Device
    • Up to 17 peripheral DMA (PDC) channels and 4-channel central DMA
  • Low Power Modes
    • Sleep and Backup modes, down to 2.5μA in Backup mode
    • VDDBU pin, RTC, 32 backup registers backup domain
    • 0.6μA ultra-low power RTC
  • Peripherals
    • USB 2.0 Device: 480Mbps, 4kb FIFO, up to 7 bidirectional Endpoints, dedicated DMA
    • 4-channel 16-bit PWM (PWMC)
    • 32-bit Real-Time Timer (RTT) and RTC with calendar and alarm features
Published: 2019-02-15 | Updated: 2023-05-17