PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor lv
About This Book
This reference manual describes the PXN20 microcontroller family for software and hardware developers.
Information regarding bus timing, signal behavior, and AC, DC, and thermal characteristics are detailed
in the device data sheet (PXN20 Microcontroller Data Sheet).
The information in this book is subject to change without notice, as described in the disclaimers on the title
page. As with any technical documentation, the reader needs to make sure to use the most recent version
of the documentation.
To locate any published errata or updates for this document, refer to the world-wide web at
http://www.freescale.com/powerpc.
Audience
This manual is intended for system software and hardware developers and applications programmers who
want to develop products with the PXN20 microcontroller family. It is assumed that the reader understands
operating systems, microprocessor system design, basic principles of software and hardware, and basic
details of the Power
Architecture™.
Organization
This document includes chapters that describe:
• The microcontroller as a whole
• The functionality of the individual modules on the microcontroller
When the microcontroller is specified as “PXN20,” the reader is instructed to apply this information to all
of the microcontrollers specified on the front cover of this manual, unless individual device-specific details
are provided in that chapter.
The following summary provides a brief description of the major sections of this manual:
• Chapter 1, Introduction, includes general descriptions of the modules and features incorporated in
the device while focusing on new features.
• Chapter 2, Memory Map, provides a high-level listing of the PXN20 memory map.
• Chapter 3, Signal Description, summarizes the external signal functions, their static electrical
characteristics, and pad configuration settings for the PXN20.
• Chapter 4, Resets, describes the reset sources available on the PXN20, including details on status
flags and default configurations.
• Chapter 5, System Clock Description, describes the various clock sources that are available on the
PXN20.
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