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INTRODUCTION
1-2
The 80C186 Modular Core family is the direct result of ten years of Intel development. It offers
the designer the peace of mind of a well-established architecture with the benefits of state-of-the-
art technology.
1.1 HOW TO USE THIS MANUAL
This manual uses phrases such as 80C186 Modular Core Family or 80C188 Modular Core, as
well as references to specific products such as 80C188EA. Each phrase refers to a specific set of
80C186 family products. The phrases and the products they refer to are as follows:
80C186 Modular Core Family: This phrase refers to any device that uses the modular
80C186/C188 CPU core architecture. At this time these include the 80C186EA/C188EA,
80C186EB/C188EB, 80C186EC/C188EC and 80C186XL/C188XL.
80C186 Modular Core: Without the word family, this phrase refers only to the 16-bit bus mem-
bers of the 80C186 Modular Core Family.
80C188 Modular Core: This phrase refers to the 8-bit bus products.
80C188EC: A specific product reference refers only to the named device. For example, On the
80C188EC… refers strictly to the 80C188EC and not to any other device.
Table 1-1. Comparison of 80C186 Modular Core Family Products
Feature 80C186XL 80C186EA 80C186EB 80C186EC
Enhanced 8086 Instruction Set
Low-Power Static Modular CPU
Power-Save (Clock Divide) Mode
Powerdown and Idle Modes
80C187 Interface
ONCE Mode
Interrupt Control Unit 8259
Compatible
Timer/Counter Unit
Chip-Select Unit Enhanced Enhanced
DMA Unit
2 Channel 2 Channel 4 Channel
Serial Communications Unit
Refresh Control Unit Enhanced Enhanced
Watchdog Timer Unit
I/O Ports 16 Total 22 Total