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基于AT32UC3A EVK1105设计的32位MCU开发技术

• AT32UC3A是完整的系统级芯片微控制器,采用VR32 UC RISC,工作频率高达66MHz,设计用于对成本敏感的嵌入式应用,特别是低功耗,高代码效率和高性能. AT32UC3贴片电感器A还集成了闪存和SRAM存储器,外设直接存储器访问控制器(PDCA),以及PowerManager电源管理.此外还有多种通信接口如UART,SPI,TWI,同步串行控制器,USB和以太网MAC等.本文介绍了AT32UC3A主要特性, 方框图以及32位AVR EVK1105评估板特性,详细电路图和材料清单(BOM).
  
  AVR®32 32-Bit Microcontroller
  
  The AT32UC3A is a complete System-On-Chip microcontroller based on the AVR32 UC RISC processor running at frequencies up to 66 MHz. AVR32 UC is a high-performance 32-bit RISC microprocessor core, designed for cost-sensitive embedded applications, with particular emphasis on low power consumption, high code density and high performance.
  The processor implements a Memory Prote一体电感ction Unit (MPU) and a fast and flexible interrupt controller for supporting modern operating systems and real-time operating systems. Higher computation capabilities are achievable using a rich set of DSP instructions.
  
  The AT32UC3A incorporates on-chip Flash and SRAM memories for secure and fast access. For applications requiring additional memory, an external memory interface is provided on AT32UC3A0 derivatives.
  
  The Peripheral Direct Memory Access controller (PDCA) enables data transfers between peripherals and memories without processor involvement. PDCA drastically reduces processing overhead when transferring continuous and large data streams between modules within the MCU.
  
  The PowerManager improves design flexibility and security: the on-chip Brown-Out Detector monitors the power supply, the CPU runs from the on-chip RC oscillator or from one of external oscillator sources, a Real-Time Clock and its associated timer keeps track of the time.
  
  The Timer/Counter includes three identical 16-bit timer/counter channels. Each channel can be independently programmed to perform frequency measurement, event counting插件电感, interval measurement, pulse generation, delay timing and pulse width modulation.
  
  The PWM modules provides seven independent channels with many configuration options including polarity, edge alignment and waveform non overlap control. One PWM channel can trigger ADC conversions for more accurate close loop control implementations.
  
  The AT32UC3A also features many communication interfaces for communication intensive applications. In addition to standard serial interfaces like UART, SPI or TWI, other interfaces like flexible Synchronous Serial Controller, USB and Ethernet MAC are available.
  
  The Synchronous Serial Controller provides easy access to serial communication protocols and audio standards like I2S.
  
  The Full-Speed USB 2.0 Device interface supports several USB Classes at the same time
  thanks to the rich End-Point configuration. The On-The-GO (OTG) Host interface allows device like a USB Flash disk or a USB printe绕行电感器r to be directly connected to the processor.
  
  The media-independent interface (MII) and reduced MII (RMII) 10/100 Ethernet MAC module provides on-chip solutions for network-connected devices.
  
  AT32UC3A integrates a class 2+ Nexus 2.0 On-Chip Debug (OCD) System, with non-intrusive real-time trace, full-speed read/write memory access in addition to basic runtime control.
  
  AT32UC3A主要特性:
  
  • High Performance, Low Power AVR®32 UC 32-Bit Microcontroller
  
  – Compact Single-cycle RISC Instruction S电感器的作用是什么et Including DSP Instruction Set
  
  – Read-Modify-Write Instructions and Atomic Bit Manipulation
  
  – Performing 1.49 DMIPS / MHz
  
  Up to 91 DMIPS Running at 66 MHz from Flash (1 Wait-State)
  
  Up to 49 DMIPS Running at 33MHz from Flash (0 Wait-State)
  
  – Memory Protection Unit
  
  • Multi-hierarchy Bus System
  
  – High-Performance Data Transfers on Separate Buses for Increased Performance
  
  – 15 Peripheral DMA Channels Improves Speed for Peripheral Communication
  
  • Internal High-Speed Flash
  
  – 512K Bytes, 256K Bytes, 128K Bytes Versions
  
  – Single Cycle Access up to 33 MHz
  
  – Prefetch Buffer Optimizing Instruction Execution at Maximum Speed
  
  – 4ms Page Programming Time and 8ms Full-Chip Erase Time
  
  – 100,000 Write Cycles, 15-year Data Retention Capability
  
  – Flash Security Locks and User Defined Configuration Area
  
  • Internal High-Speed SRAM, Single-Cycle Access at Full Speed
  
  – 64K Bytes (512KB and 256KB Flash), 32K Bytes (128KB Flash)
  
  • External Memory Interface on AT32UC3A0 Derivatives
  

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  USB到多路RS422转换器的电路实现摘要：当USB接口与多个RS422设备进行通信时，由于PC机的USB接口数量有限，这种情况给用户带来极大的不便。为了解决这个问题，采用FTDI公司的F4232H芯片，结合USB总线供电结构，通过简单的

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