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Kinetis MCU上支持无晶振USB(英文)
资料介绍
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
部分文件列表
| 文件名 | 大小 |
| Kinetis_MCU上支持无晶振USB(英文).pdf | 158K |
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