INTRODUCTION

Motorola has developed a low-cost version of the well-known MC68302 integrated multiprotocol processor (IMP) called the MC68LC302. Simply put, the LC302 is a traditional 68302 minus the third serial communication controller (SCC3) and has a new static 68000 core, a new timer and low power modes. It is packaged in a low profile 100 TQFP that reduces board space from the regular 68302, as well as making it suitable for use in height restricted applications such as PCMCIA.

FEATURES

The features of the LC302 are as follows. The items in bold face type show major differences from the MC68302, although a complete list of differences is given in 1.4 LC302 Differences.

? On-Chip Static 68000 Core Supporting a 16- or 8-Bit M68000 Family-System

? SIB Including:

Independent Direct Memory Access (IDMA) Controller.

Interrupt Controller with Two Modes of Operation

Parallel Input/Output (I/O) Ports, some with Interrupt Capability

Parallel Input/Output (I/O) Ports on D15-D8 in 8 bit mode

On-Chip 1152-Byte Dual-Port RAM

Three Timers Including a Watchdog Timer

New Periodic Interrupt Timer (PIT)

Four Programmable Chip-Select Lines with Wait-State Generator Logic

Programmable Address Mapping of the Dual-Port RAM and IMP Registers

On-Chip Clock Generator with Output Signal

On-Chip PLL Allows Operation with 32kHz or 4MHz Crystals

Glueless Interface to EPROM, SRAM, Flash EPROM, and EEPROM

Allows Boot in 8-bit Mode, and Running Switch to 16-bit Mode

System Control:

System Status and Control Logic

Disable CPU Logic (Slave Mode Operation)

Hardware Watchdog

New Low-Power (Standby) Modes With Wake-up From 2 Pins or PIT

Freeze Control for Debugging (Available Only in the PGA Package)

DRAM Refresh Controller

? CP Including:

Main Controller (RISC Processor)

Two Independent Full-Duplex Serial Communications Controllers (SCCs)

Supporting Various Protocols:

High-Level/Synchronous Data Link Control (HDLC/SDLC)

Universal Asynchronous Receiver Transmitter (UART)

Binary Synchronous Communication (BISYNC)

Transparent Modes

Autobaud Support Instead of DDCMP and V.110

Boot from SCC Capability

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