MC68LC302 Datasheet, PDF (12/169 Pages) Motorola, Inc – Low Power Integrated Multiprotocol Processor Reference Manual

Introduction
Four Serial DMA Channels for the Two SCCs
Flexible Physical Interface Accessible by SCCs Including:
Motorola Interchip Digital Link (IDL)
General Circuit Interface (GCI, Also Known as IOM¹-2)
Pulse Code Modulation (PCM) Highway Interface
Nonmultiplexed Serial Interface (NMSI) Implementing Standard
Modem Signals
SCP for Synchronous Communication
Two Serial Management Controllers (SMCs) To Support IDL and GCI Auxiliary
Channels
• 100 Pin Thin Quad Flat Pack (TQFP) Packaging
1.3 LC302 APPLICATIONS
The LC302 excels in several applications areas.
First, any application using the 68302, but not needing all three serial channels is a potential
candidate for the LC302. Note however, that the LC302 sacrifices most of the provision for
external bus mastership, thus the LC302 may not be appropriate where the 68302 is used
as part of larger systems.
Second, the LC302 excels in low power and portable applications. The inclusion of a static
68000 core coupled with the low power modes built into the device make it ideal for hand-
held, or other low power applications. The new 32 kHz or 4 MHz PLL option greatly reduces
the total power budget of the designer’s board, and allows the LC302 to be an effective
device in low power systems. The LC302 can then optionally generate a full frequency clock
for use by the rest of the board. During low power modes, the new periodic interrupt timer
(PIT) allows the device to be woken up at regular intervals. In addition, two pins allow the
device to be woken up from low power modes.
Third, given that the LC302 is packaged in a 100TQFP package, it allows the 68302 to be
used in space critical applications, as well as height critical applications such as PCMCIA
cards.
Fourth, since the disable CPU mode (also known as slave mode) is still retained, the LC302
can function as a fully intelligent DMA-driven peripheral chip containing serial channels, tim-
ers, and chip selects, etc.
1.4 LC302 DIFFERENCES
The LC302 has some specific differences from the 68302. Most of these differences simply
result from the reduction in pins from 132 on the original 68302, to 100 pins on the LC302.
1. _{IOM is a trademark of Siemens AG}
MOTOROLA
MC68LC302 REFERENCE MANUAL
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