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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
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USB（通用串行总线）
USB是一种非常流行的串行接口，特别是对于个人电脑而言。众所周知，该接口用于连接键盘、鼠标、打印机、闪存、硬盘驱动器、扬声器等设备。
USB有多种速度版本，低速（1.5Mbps）、全速（12Mbps）、高速（480Mbps）等，东芝TX03系列微处理器支持USB全速版本。USB接口采用分层结构。一个“主机”控制着网络中的许多“设备”。例如，PC是主机，设备是通过USB电缆连接到PC的任何设备，比如键盘、鼠标等。
USB的显著特点是即插即用。连接或卸下USB设备时，不必关闭电脑。这就是USB变得如此流行的原因之一。
USB的数据线有四根线：VDD，GND，信号D＋和信号D-。D＋和D-是一个传输数据的互补值。如果D＋为高电平，D-为低电平，则数据被称为“差分1”。若D＋为低，D-为高，则数据被称为“差分0”，USB数据格式为NRZI（反向不归零）。当一个时钟间隔内没有变化时，此格式将定义数据“1”，当发生从高到低或从低到高的变化时，则定义数据“0”。
USB没有任何时钟线。所以主机和驱动器必须彼此同步。传输8位SYNC码，使接收器与发射器以USB全速同步。
产品线
采用USB接口的微控制器产品如下。
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