[detaro]

First line of the page: Yubikey is a curiosity-driven side project for us and we have plans to dig a bit further into hardware as time permits. If anybody could confidentially help with NXP datasheets, it would be much appreciated.

I guess they could have waited until they had more to publish it, but I found it interesting regardless

[danielvf]

NXP processor manuals and datasheets are on NXP's website. Just google for "13xx User Manual". Here's a link to 13xx series user manual[1]

(I've just finished a year working on an embedded project using NXP 13xx series processors, and NXP's documentation is top notch.)

[1] http://www.nxp.com/documents/user_manual/UM10375.pdf