INTEL 8085

This chapter describes hardware, software, and interfacing aspects of the Intel 8085. Topics include 8085 register architecture, addressing modes, instruction set, input/output, and system design.

2.1    Introduction

The Intel 8085 is an 8-bit microprocessor. The 8085 is designed using NMOS in 40-in DIP (Dual In-line Package). The 8085 can be operated from either 3.03 MHz maximum (8085A) or 5 MHz maximum (8085A-2) internal clock frequency.

The 8085 has three enhanced versions, namely, the 8085AH, 8085AH-2, and 8085AH-1. These enhanced processors are designed using the HMOS (High-density MOS) technology. Each is packaged in a 40-pin DIP like the 8085. These enhanced microprocessors consume 20% lower power than the 8085A. The internal ...

Get Microprocessors and Microcomputer-Based System Design, 2nd Edition now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.