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Kinetis MCU上支持无晶振USB(英文)

更新时间:2023-01-07 13:57:48 大小:158K 上传用户:sun2152查看TA发布的资源 标签:kinetismcuusb 下载积分:1分 评价赚积分 (如何评价?) 收藏 评论(0) 举报

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1 Introduction Some of the newer Kinetis devices include a new feature that allows for USB full-speed device operation with no external crystal or oscillator required for the processor. Elimination of the external clock reduces the overall system cost associated with developing a USB device application. In order to support the crystal-less USB device operation, a 48 MHz internal reference clock (IRC) and a USB clock recovery circuit have been included on these microcontrollers. This application note will discuss the features of the 48 MHz IRC and the USB clock recovery circuit, including how they can be used to implement a full-speed USB device without a crystal. Also covered will be the initialization required to configure the USB to use the 48 MHz IRC as the clock source, and enabling of the clock recovery. 2 On-chip circuitry to support crystal-less USB operation The following sections describe the features and use of the new 48 MHz IRC and the USB clock recovery block that have been added to allow for crystal-less USB operation

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Kinetis_MCU上支持无晶振USB(英文).pdf 158K

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