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MC68LC302/D
MC68LC302
Product Brief
Low Cost Integrated Multiprotocol Processor
Freescale Semiconductor, Inc...
Freescale
introduces the low cost version of the well-known MC68302 Integrated Multiprotocol Processor (IMP).
It will be known as the MC68LC302, and will expand a family of devices based on the MC68302.
Some features and pins have been removed while other features have been enhanced as compared to the
original MC68302. Simply put, the MC68LC302 is a traditional MC68302 with a new static 68000 core, a new
timer and low power modes, but without the third serial communication controller (SCC). It is packaged in a low
profile 100 TQFP that requires less board space than the regular MC68302, as well as making it suitable for
use in height restricted applications such as PCMCIA.
.
LOW
POWER
CONTROL
INTERRUPT
CONTROLLER
1 GENERAL-
PURPOSE
DMA
CHANNEL
3 TIMERS
4 CHIP SELECTS
PIO
SYSTEM CONTROL
RAM / ROM
STATIC
M68000
CORE
68000
SYSTEM BUS
20 ADDRESS
8/16 DATA
1152 BYTES
DUAL-PORT
RAM
4 SDMA
CHANNELS
PIT
This document contains information on a product under development.
Freescale
reserves the right to change or discontinue this product without notice.
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
FEATURES
The features of the MC68LC302 are as follows.
Bold face
items show major differences from the MC68302.
• 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
— 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 32 kHz or 4 MHz 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 Two 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
Freescale Semiconductor, Inc...
MC68LC302 PRODUCT INFORMATION
For More Information On This Product,
Go to: www.freescale.com
Freescale Semiconductor, Inc.
MC68LC302 APPLICATIONS
The MC68LC302 excels in several applications areas.
First, any application using the MC68302,but not needing all three serial channels is a potential candidate for
the MC68LC302. Note however, that the MC68LC302 sacrifices most of the provision for external bus
mastership, thus the MC68LC302 may not be appropriate where the MC68302 is used as part of larger
systems.
Second, the MC68LC302 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 handheld, 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 MC68LC302 to be an effective device in low power systems. The MC68LC302 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 awaken at regular intervals. In addition, two pins can awaken
the device from low power modes.
Third, given that the MC68LC302 is packaged in a 100TQFP package, it allows the MC68LC302 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 MC68LC302 can function
as a fully intelligent DMA-driven peripheral chip containing serial channels, timers, chip selects, etc.
Freescale Semiconductor, Inc...
DIFFERENCES BETWEEN THE MC68LC302 AND MC68302
The MC68LC302 has some specific differences from the MC68302. Even though the functionality of the
processor and the peripherals remain the same, some of the flexibility has been removed due to the pin
reduction from 132 on the original MC68302, to 100 pins on the MC68LC302.
The following features have been removed or modified from the MC68302 in order to make the MC68LC302
possible.
• SCC3 and its baud rate generator (BRG3) are removed.
• External masters are not able to take the bus away from the MC68LC302 through the normal bus arbi-
tration scheme as these pins no longer exist. An external master can still maintain bus mastership
through a simple scheme using the HALT pin. This restriction does not apply when using the MC68LC302
in CPU disabled mode (slave mode), in which case BR, BG, and BGACK are all available.
MC68LC302 PRODUCT INFORMATION
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Freescale Semiconductor, Inc.
• The SCP pins are now muxed with PA8, PA9, and PA10. The TXD3, RXD3, and RCLK3 functions asso-
ciated with SCC3 are eliminated.
• The UDS, LDS, and R/W pins are not available except in slave mode, where they replace the IPL2-0 pins.
Instead, the new pins WEH, WEL, and OE have been defined for glueless interfacing to memory.
• PA12 is now muxed with the MODCLK pin, which is associated with the 32 KHz or 4 MHz PLL. The MOD-
CLK pin is sampled after reset, and then becomes PA12.
• New VCCSYN, GNDSYN, and XFC pins have been added in support of the on-chip PLL.
• For purposes of emulation and development support only, a special 132 PGA version is supported. This
version adds back the FC2-0, IAC, FRZ, and AVEC pins. The FC2-0 pins allow bus cycles to be distin-
guished between program and data accesses, interrupt cycles, etc. The IAC, FRZ, and AVEC pins are
provided so that emulation vendors can quickly retrofit their existing MC68302 emulator designs to sup-
port the MC68LC302.
Freescale Semiconductor, Inc...
MC68LC302 PRODUCT INFORMATION
For More Information On This Product,
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Freescale Semiconductor, Inc.
MC68LC302 PIN DESCRIPTION
NMSI1/ ISDN I/F
RXD1/L1RXD
TXD1/L1TXD
RCLK1/L1CLK
TCLK1/L1SY0/SDS1
CD1/L1SY1
CTS1/L1GR
RTS1/L1RQ/GCIDCL
Address Bus
A1-A19
Chip Select
CS0/IOUT2
CS3-CS1
Data Bus
D0-D15
NMSI2/ PAIO
Freescale Semiconductor, Inc...
RXD2/PA0
TXD2/PA1
RCLK2/PA2
TCLK2/PA3
CTS2/PA4
RTS2/PA5
CD2/PA6
BRG2/SDS2/PA7
AS
WEH/A0
WEL/WE
DTACK
OE
Bus Control
(UDS/A0)
(LDS/DS)
(R/W)
System Control
MC68LC302
Signals
RESET
HALT
BUSW
DISCPU
PAIO/ SCP
SPRXD/PA8
SPTXD/PA9
SPCLK/PA10
MODCLKPA12
Interrupt Control
TIMER/PBIO
TIN1/PB3
TIN2/PB5
TOUT2/PB6
WDOG/PB7
IPL0/IRQ1 (BR)
IPL1/IRQ6 (BGACK)
IPL2/IRQ7 (BG)
PB8
PB9
PB10
PB11
IQGND(2)
IQVDD(2)
Clock
CLKO
EXTAL
XTAL
XFC
MC68LC302 PRODUCT INFORMATION
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Go to: www.freescale.com
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