原标题：Embest Atmel AT91SAM3U ARM-CM3 MCU开发方案

　　Embest公司的AT91SAM3U ARM-CM3开发板集成了 基于Cortex-M3核处理器的ATMEL ATSAM3U4E,工作频率96MHz,具有USB, I2C, MCI接口, TFT-LCD, USART接口,96个I/O口,支持SRAM/NOR/NAND存储器的EBI等,能用来产生和测试ATMEL SAM3U微控制器系列应用程序,主要用在家庭娱乐如音频和遥控,工业自动化如工业通信和仪表,移动电子如手机和手持音频播放器等.本文介绍了AT91SAM3U主要特性,100和144引脚AT91SAM3U方框图,以及ATSAM3U ARM-CM3开发板硬件指标,方框图和电路图.

　　Atmel’s SAM3U 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 96 MHz and features up to 256 Kbytes of Flash and up to 48 Kbytes of SRAM. The peripheral set includes a High Speed USB Device port with embedded transceiver, a High Speed MCI for SDIO/SD/MMC, an External Bus Interface with NAND Flash controller, 4x USARTs, 2x TWIs, 1x SPI, as well as 1 PWM timer, 3x general purpose 16-bit timers, an RTC, a 12-bit ADC and a 10- bit ADC.

　　The SAM3U architecture is specifically designed to sustain high speed data transfers. It includes a multi-layer bus matrix as well as multiple SRAM banks, PDC and DMA channels that enable it to run tasks in parallel and maximize data throughput.It can operate from 1.62V to 3.6V and comes in 100-pin and 144-pin LQFP and BGA packages. The SAM3U device is particularly well suited for USB applications: data loggers, PC peripherals and any high speed bridge (USB to SDIO, USB to SPI, USB to External Bus Interface).

　　AT91SAM3U主要特性:

　　• Core

　　– ARM® Cortex™-M3 revision 2.0 running at up to 96 MHz

　　– Memory Protection Unit (MPU)

　　– Thumb®-2 instruction set

　　• Memories

　　– From 64 to 256 Kbytes embedded Flash, 128-bit wide access, memory accelerator, dual bank

　　– From 16 to 48 Kbytes embedded SRAM with dual banks

　　– 16 Kbytes ROM with embedded bootloader routines (UART, USB) and IAP routines

　　– Static Memory Controller (SMC): SRAM, NOR, NAND support. NAND Flash controller with 4-kbyte RAM buffer and ECC

　　• System

　　– Embedded voltage regulator for single supply operation

　　– POR, BOD and Watchdog for safe reset

　　– Quartz or resonator oscillators: 3 to 20 MHz main and optional low power 32.768 kHz for RTC or device clock.

　　– High precision 4/8/12 MHz factory trimmed internal RC oscillator and slow clock internal RC oscillator

　　– One PLL for device clock and one dedicated PLL for USB 2.0 High Speed Device

　　– Up to 19 peripheral DMA (PDC) channels and 4-channel central DMA

　　• Low Power Modes

　　– Sleep and Backup modes, down to 2.5 μA in Backup mode.

　　–Backup domain: VDDBU pin, RTC, 32 backup registers

　　–Ultra low power RTC: 0.6 μA

　　• Peripherals

　　– USB 2.0 Device: 480 Mbps, 4-kbyte FIFO, up to 7 bidirectional Endpoints, dedicated

　　DMA

　　– Up to 4 USARTs (ISO7816, IrDA®, Flow Control, SPI, Manchester support) and one

　　UART

　　– Up to 2 TWI (I2C), 1 SPI, 1 SSC (I2S), 1 HSMCI (SDIO/SD/MMC)

　　– 3-Channel 16-bit Timer/Counter (TC) for capture, compare and PWM

　　– 4-channel 16-bit PWM (PWMC)

　　– 32-bit Real Time Timer (RTT) and RTC with calendar and alarm features

　　– 8-channel 12-bit 1Msps ADC with differential input mode and programmable gain

　　stage, 8-channel 10-bit ADC

　　• I/O

　　– Up to 96 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/Outputs (PIO)

　　• Packages

　　– 100-lead LQFP, 14 x 14 mm, pitch 0.5 mm

　　– 100-ball LFBGA, 9 x 9 mm, pitch 0.8 mm

　　144-lead LQFP, 20 x 20 mm, pitch 0.5 mm

　　– 144-ball LFBGA, 10 x 10 mm, pitch 0.8 mm

　　图1.100引脚AT91SAM3U 方框图

　　图2.144引脚AT91SAM3U 方框图

　　ATSAM3U ARM-CM3开发板

　　The ATSAM3U ARM-CM3 Board is an ARM embedded evaluation board produced by Embest, integrate the ATMEL Cortex-M3 core-based processor ATSAM3U4E, operating at 96 MHz frequency. The board features USB, I2C, MCI interface, TFT-LCD, USART interface, 96 I/O port, EBI support SRAM/NOR/NAND memory, etc. Plenty of software examples, which can be used in Keil MDK environment, are accompanied in CDROM. You can use the Cortex-M3 based AT91SAM3U Evaluation Board to generate and test application programs for the ATMEL SAM3U Series microcontroller family. With this hands-on process, you can determine the hardware and software requirements for current and future product development.

　　The AT91SAM3U Evaluation Board ships with the AT91SAM3U device that is a superset of several other device variants of the ATMEL SAM3U microcontroller series. The AT91SAM3U Board contains all the hardware components required in a single-chip AT91SAM3U4E system.

　　图3.ATSAM3U ARM-CM3开发板外形图

　　ATSAM3U ARM-CM3开发板硬件指标:

　　The connectors on the AT91SAM3U evaluation board provide easy access to many of the AT91SAM3U’s on-chip peripherals.

　　Serial Port

　　A standard DB9 connector is on the AT91SAM3U board for the AT91SAM3U’s built-in UART interfaces. This is a full duplex, serial port.

　　CAN Port

　　A standard DB9 connector for applications requiring CAN communications.

　　USB Port

　　A standard USB Type B connector for applications requiring USB communications.

　　LCD Display

　　A detachable, 240x320 TFT, color LCD display. You may use this graphic display device to show real-time debug and program status messages.

　　On-board Battery

　　A removable, lithium battery is included on the AT91SAM3U to maintain power to the real-time clock when the board disconnects from the main power supply.

　　Analog Voltage Control for ADC Input

　　An adjustable analog voltage source for testing the Analog to Digital converter built into the AT91SAM3U.

　　External Memory

　　The AT91SAM3U board includes 1 Mbyte of external static RAM and 8 Mbytes of external SPI Flash memory.

　　MicroSD Card Connector

　　A MicroSD Card connector for developing applications requiring access to MicroSD Cards.

　　ETM Trace Debug

　　An ETM connector for on-chip debugging via the Embedded Trace Macrocell capabilities of the STM32F103 device.

　　JTAG Download and Debug

　　A JTAG on-chip debug interface, coupled with the ULINK USB-JTAG adapter, provides flash programming and real-time in-circuit emulation of the ATSAM3U device.

　　技术数据:

　　Parameter Description

　　Supply Voltage 5 Volts DC (provided by power adapter)

　　Supply Current 210mA typical, 320mA maximum

　　XTAL Frequency 12 MHz

　　Microcontroller AT91SAM3U4E LQFP 144 Pins

　　Peripherals 2 × RS232 Interface,

　　1 × USB Device Interface (High-speed),

　　1 × 2.8” Color graphic display (240x320),

　　1 × MicroSD Memory Card connector,

　　1 × JTAG Interface,

　　5 × Push Buttons (Reset, Wake Up, Tampering, User),

　　2 × BNC Interface,

　　1 x RTC Unit with Battery,

　　1 × Analog Input (connected to potentiometer),

　　1 × Analog Output (connected to speaker by default)

　　Board Size 135mm x 90mm (5.3" x 3.5")

　　Weight 320g

　　图4.ATSAM3U 开发板方框图