这个是我浏览时发现在，不敢独享特来分享。
According to an Atmel engineering rep, the application notes target the use of peripheral modules and are based on drivers already available in the ASF (Atmel Software Framework). “The application notes highlight the availability of the drivers and offers the reader relevant details about the API (application programming interface),” the rep explained.
“This significant increase in the number of application notes for the SAM4 series gives the engineer a better starting point for using the products. More specifically, the new application notes cover the Atmel SAM4S/SD, SAM4N, SAM4L/LS, SAM4E, and to some extent, also the SAM4C and SAM G51/53 families.” The following app notes are now available from the Atmel web site in PDF format:
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