Author Description

This book looks at effective techniques for interfacing between the microprocessor and external peripheral equipment. Offering a balanced treatment of both hardware and software applications, it begins by discussing the structure and timing of signals on microprocessor bus systems and the memory devices used to store and retrieve data. Goes on to provide practical coverage of the parallel interface, its underlying principles, and techniques of implementation, including how to handle both dedicated and memory mapped input-output systems, programmable I/O port devices, and some specially designed parallel interface chips. Provides examples of typical applications of I/O ports, including the connection of switches and keyboards, the drive circuits of lamps and relays, and driving stepper-type monitors. Also discussed are two standard parallel interface schemes which are commonly used with microcomputer systems. Other topics cover the basics of synchronous and asynchronous serial transmission, the advantage of external hardware in implementing counting and timing functions; interfacing digital and analogue converters to the CPU bus system; and effective ways of checking the input lines.