AMD Comprehensive Guide to Am186 Microcontrollers

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.

νChapter 1 introduces the features and performance aspects of the Am186ER and Am188ER microcontrollers.

νChapter 2 describes the programmer’s model of the Am186 and Am188 family microcontrollers, including an instruction set overview and register model.

νChapter 3 provides an overview of the system interfaces, along with clocking features.

Introduction and Overview xiii