Intel386™ EX Embedded Microprocessor
1.0
Introduction
The Intel386™ EXTB embedded processor operates at 20 or 25 MHz at 3 Volts nominal. The
Intel386 EXTC embedded processor operates at 25 or 33 MHz at 5 Volts. In this datasheet,
“Intel386 EX processor” refers to both the Intel386 EXTB and EXTC processors.
The Intel386 EX embedded processor is a highly integrated, 32-bit, fully static processor optimized
for embedded control applications. With a 16-bit external data bus, a 26-bit external address bus,
and Intel’s System Management Mode (SMM), the Intel386 EX microprocessor brings the vast
software library of Intel386 architecture to embedded systems. It provides the performance benefits
of 32-bit programming with the cost savings associated with 16-bit hardware systems.
Figure 1. Intel386™ EX Embedded Processor Block Diagram
Address
Data
Bus Interface
Unit
Chip-select
Unit
JTAG Unit
Address
Intel386™ CX Core
Core Enhancements
Processor Core
- A20 Gate
- CPU Reset
- SMM
Clock and Power
Management Unit
DRAM Refresh
Control Unit
Watchdog Timer Unit
Bus Monitor
Asynchronous Serial I/O
2 channels
(16450 compatible)
Synchronous Serial I/O
1 channel, full duplex
Timer/counter Unit
3 channels
(82C54 compatible)
Data
I/O Ports
INTR
Interrupt Control Unit
DMA Controller
2 channels
(8237A compatible)
and Bus Arbiter Unit
A2849-02
Datasheet
7
INTEL [ INTEL CORPORATION ]
