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80386EX Datasheet

Intel386 EX Embedded Microprocessor

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Intel386™ EX Embedded
Microprocessor
Product Features
Datasheet
s Static Intel386™ CPU Core
— Low Power Consumption
— Operating Power Supply
EXTB: 2.7 V to 3.6 V
EXTC: 4.5 V to 5.5 V
— Operating Frequency
20 MHz EXTB at 2.7 V to 3.6 V
25 MHz EXTB at 3.0 V to 3.6 V;
25/33 MHz EXTC at 4.5 V to 5.5 V
s Transparent Power-management System
Architecture
— Intel System Management Mode
Architecture Extension for Truly
Compatible Systems
— Power Management Transparent to
Operating Systems and Application
Programs
— Programmable Power-management
Modes
s Powerdown Mode
— Clock Stopping at Any Time
— Only 10–20 µA Typical CPU Sink
Current
s Full 32-bit Internal Architecture
— 8-, 16-, 32-bit Data Types
— 8 General Purpose 32-bit Registers
s Runs Intel386 Architecture Software in a
Cost-effective 16-bit Hardware
Environment
— Runs Same Applications and Operating
Systems as the Intel386 SX and Intel386
DX Processors
— Object Code Compatible with 8086,
80186, 80286, and Intel386 Processors
s High-performance 16-bit Data Bus
— Two-clock Bus Cycles
— Address Pipelining Allows Use of
Slower, Inexpensive Memories
s Extended Temperature Range
s Integrated Memory Management Unit
— Virtual Memory Support
— Optional On-chip Paging
— 4 Levels of Hardware-enforced
Protection
— MMU Fully Compatible with MMUs of
the 80286 and Intel386 DX Processors
s Virtual 8086 Mode Allows Execution of
8086 Software in a Protected and Paged
System
s Large Uniform Address Space
— 64 Megabyte Physical
— 64 Terabyte Virtual
— 4 Gigabyte Maximum Segment Size
s On-chip Debugging Support Including
Breakpoint Registers
s Complete System Development Support
s High Speed CHMOS Technology
s Two Package Types
— 132-pin Plastic Quad Flatpack
— 144-pin Thin Quad Flatpack
s Integrated Peripheral Functions
— Clock and Power Management Unit
— Chip-select Unit
— Interrupt Control Unit
— Timer/Counter Unit
— Watchdog Timer Unit
— Asynchronous Serial I/O Unit
— Synchronous Serial I/O Unit
— Parallel I/O Unit
— DMA and Bus Arbiter Unit
— Refresh Control Unit
— JTAG-compliant Test-logic Unit
This datasheet applies to devices marked EXTB and EXTC. If you require information about
devices marked EXSA or EXTA, refer to a previous revision of this datasheet, order number
272420-004.
Order Number: 272420-007
October 1998
Intel Corporation
Intel Corporation



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