MC9328MX21 Datasheet, PDF (3/106 Pages) Motorola, Inc – i.MX family of microprocessors

Introduction
1.1 Conventions
This document uses the following conventions:
• OVERBAR is used to indicate a signal that is active when pulled low: for example, RESET.
• Logic level one is a voltage that corresponds to Boolean true (1) state.
• Logic level zero is a voltage that corresponds to Boolean false (0) state.
• To set a bit or bits means to establish logic level one.
• To clear a bit or bits means to establish logic level zero.
• A signal is an electronic construct whose state conveys or changes in state convey information.
• A pin is an external physical connection. The same pin can be used to connect a number of signals.
• Asserted means that a discrete signal is in active logic state.
— Active low signals change from logic level one to logic level zero.
— Active high signals change from logic level zero to logic level one.
• Negated means that an asserted discrete signal changes logic state.
— Active low signals change from logic level zero to logic level one.
— Active high signals change from logic level one to logic level zero.
• LSB means least significant bit or bits, and MSB means most significant bit or bits. References to low and
high bytes or words are spelled out.
• Numbers preceded by a percent sign (%) are binary. Numbers preceded by a dollar sign ($) or 0x are
hexadecimal.
1.2 Target Applications
The i.MX21 is targeted for advanced information appliances, smart phones, Web browsers, digital MP3 audio
players, handheld computers based on the popular Palm OS platform, and messaging applications.
1.3 Reference Documentation
The following documents are required for a complete description of the i.MX21 and are necessary to design
properly with the device. Especially for those not familiar with the ARM926EJ-S processor or previous
DragonBall products, the following documents are helpful when used in conjunction with this manual.
ARM Architecture Reference Manual (ARM Ltd., order number ARM DDI 0100)
ARM7TDMI Data Sheet (ARM Ltd., order number ARM DDI 0029)
ARM920T Technical Reference Manual (ARM Ltd., order number ARM DDI 0151C)
MC9328MX21 Product Brief (order number MC9328MX21P/D)
MC9328MX21 Reference Manual (order number MC9328MX21RM/D)
MC9328MX1 Product Brief (order number MC9328MX1P/D)
MC9328MX1 Data Sheet (order number MC9328MX1/D)
MC9328MX1 Reference Manual (order number MC9328MX1RM/D)
The Freescale manuals are available on the Freescale Semiconductor Web site at http://www.freescale.com. These
documents may be downloaded directly from the Freescale Web site, or printed versions may be ordered. The
ARM Ltd. documentation is available from http://www.arm.com.
MC9328MX21 Product Preview, Rev. 1.1
Freescale Semiconductor
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