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Introduction and Overview
xiii
PREFACE
INTRODUCTION AND OVERVIEW
DESIGN PHILOSOPHY
AMD’s Am186™ and Am188Q™ family of microcontrollers is based on the architecture of
the original 8086 and 8088 microcontrollers, and currently includes the 80C186, 80C188,
80L186, 80L188, Am186ER, Am188ER, Am186EMLV, Am188EMLV, Am186ES,
Am188ES, Am186ESLV, Am188ESLV, Am186EM, Am188EM, Am186ED, and
Am186EDLV microcontrollers. The Am186ER and Am188ER microcontrollers provide a
natural migration path for 80C186/188 designs that need performance and system cost
enhancements.
The Am186ER and Am188ER microcontrollers provide a low-cost, high-performance solution
for embedded system designers who want to use the x86 architecture. By integrating multiple
functional blocks and 32 Kbyte of internal RAM with the CPU, the Am186ER and Am188ER
microcontrollers eliminate the need for off-chip system-interface logic. It is possible to
implement a fully functional system with ROM and RAM, serial interfaces, and custom I/O
capability without additional system-interface logic.
The Am186ER and Am188ER microcontrollers can operate at frequencies up to 40 MHz.
The microcontrollers include an on-board PLL so that the clock input frequency can be as
little as one fourth the processor operating frequency. The Am186ER and Am188ER
microcontrollers are available in versions operating at 20, 25, 33, and 40 MHz.
PURPOSE OF THIS MANUAL
This manual describes the technical features and programming interface of the Am186ER
and Am188ER microcontrollers. The complete instruction set is documented in the
Am186
and Am188 Family Instruction Set Manual,
order #21267.
INTENDED AUDIENCE
This manual is intended for computer hardware and software engineers and system
architects who are designing or are considering designing systems based on the Am186ER
and Am188ER microcontrollers.
USER’S MANUAL OVERVIEW
This manual contains information on the Am186ER and Am188ER microcontrollers and is
essential for system architects and design engineers. Additional information is available in
the form of data sheets, application notes, and other documentation that is provided with
software products and hardware-development tools.
The information in this manual is organized into 12 chapters and 1 appendix.
n Chapter 1 introduces the features and performance aspects of the Am186ER and
Am188ER microcontrollers.
n Chapter 2 describes the programmer’s model of the Am186 and Am188 family
microcontrollers, including an instruction set overview and register model.
n Chapter 3 provides an overview of the system interfaces, along with clocking
features.