SAM3S Description
Atmels SAM3S series is a member of a family of Flash microcontrollers based on the high performance 32-bit ARM Cortex-M3 RISC processor. It operates at a maximum speed of 64 MHz and features up to 256 Kbytes of Flash and up to 48 Kbytes of SRAM. The peripheral set includes a Full Speed USB Device port with embedded transceiver, a High Speed MCI for SDIO/SD/MMC, an External Bus Interface featuring a Static Memory Controller providing connection to SRAM, PSRAM, NOR Flash, LCD Module and NAND Flash, 2x USARTs, 2x UARTs, 2x TWIs, 3x SPI, an I2S, as well as 1 PWM timer, 6x general-purpose 16-bit timers, an RTC, a ADC, a 12-bit DAC and an analog comparator.

FEATUREs
• Core
    – ARM® Cortex®-M3 revision 2.0 running at up to 64 MHz
    – Memory Protection Unit (MPU)
    – Thumb®-2 instruction set
• Pin-to-pin compatible with AT91SAM7S legacy products (48- and 64-pin versions)
• Memories
    – From 64 to 256 Kbytes embedded Flash, 128-bit wide access, memory accelerator, single plane
    – From 16 to 48 Kbytes embedded SRAM
    – 16 Kbytes ROM with embedded bootloader routines (UART, USB) and IAP routines
    – 8-bit Static Memory Controller (SMC): SRAM, PSRAM, NOR and NAND Flash support
    – Memory Protection Unit (MPU)
• System
    – Embedded voltage regulator for single supply operation
    – Power-on-Reset (POR), Brown-out Detector (BOD) and Watchdog for safe operation
    – Quartz or ceramic resonator oscillators: 3 to 20 MHz main power with Failure Detection and optional low power 32.768 kHz for RTC or device clock
    – High precision 8/12 MHz factory trimmed internal RC oscillator with 4 MHz default frequency for device startup. In-application trimming access for frequency adjustment
    – Slow Clock Internal RC oscillator as permanent low-power mode device clock
    – Two PLLs up to 130 MHz for device clock and for USB
    – Temperature Sensor
    – Up to 22 peripheral DMA (PDC) channels
• Low Power Modes
    – Sleep and Backup modes, down to 3 µA in Backup mode
    – Ultra low power RTC
• Peripherals
    – USB 2.0 Device: 12 Mbps, 2668 byte FIFO, up to 8 bidirectional Endpoints. On-Chip Transceiver
    – Up to 2 USARTs with ISO7816, IrDA®, RS-485, SPI, Manchester and Modem Mode
    – Two 2-wire UARTs
    – Up to 2 Two Wire Interface (I2C compatible), 1 SPI, 1 Serial Synchronous Controller (I2S), 1 High Speed Multimedia Card Interface (SDIO/SD Card/MMC)
    – Up to 6 Three-Channel 16-bit Timer/Counter with capture, waveform, compare and PWM mode. Quadrature Decoder Logic and 2-bit Gray Up/Down Counter for Stepper Motor
    – 4-channel 16-bit PWM with Complementary Output, Fault Input, 12-bit Dead Time Generator Counter for Motor Control
    – 32-bit Real-time Timer and RTC with calendar and alarm features
    – Up to 15-channel, 1Msps ADC with differential input mode and programmable gain stage
    – One 2-channel 12-bit 1Msps DAC
    – One Analog Comparator with flexible input selection, window mode, Selectable input hysteresis
    – 32-bit Cyclic Redundancy Check Calculation Unit (CRCCU)
• I/O
    – Up to 79 I/O lines with external interrupt capability (edge or level sensitivity), debouncing, glitch filtering and on-die Series Resistor Termination
    – Three 32-bit Parallel Input/Output Controllers, Peripheral DMA assisted Parallel Capture Mode
• Packages
    – 100-lead LQFP, 14 x 14 mm, pitch 0.5 mm / 100-ball LFBGA, 9 x 9 mm, pitch 0.8 mm
    – 64-lead LQFP, 12 x 12 mm, pitch 0.5 mm / 64-pad QFN 9x9 mm, pitch 0.45 mm
    – 48-lead LQFP, 9 x 9 mm, pitch 0.5 mm / 48-pad QFN 7x7 mm, pitch 0.45 mm