9 Computers and Device Interconnection

Chapter 9 Computers and Device Interconnection

Physics Lecture Notes – Phys 395 Electronics Book
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Summary of Contents

Physics Lecture Notes – Phys 395 Electronics Book

  • Chapter 9Computers and DeviceInterconnectionThese lectures will deal with the interface between computer software and electronic instru-mentation.9.1Elements of the MicrocomputerWe will treat the microprocessor as just another IC chip on a circuit board. Our stripped-down version will result in a computer suitable to specialized, single-process or single-circuitapplications.In a typical research laboratory arrangement, the computer would be used to controlequipment, acquire data from the measurement apparatus, perform mathematical operationson the data and make these available on a display device for operator review.9.1.1Microprocessor and MicrocomputerThe key element of a microcomputer is the LSI microprocessor chip, whose circuitry canacquire, interpret, and execute a sequence of logical and arithmetic instructions. Althoughmost computer programming is done in a high level language, the processor itself deals onlywith binary numbers that represent operation codes (move data, add, subtract, compare,jump, etc.)and addresses (routing information for the data flow) of registers, memorylocations or input/output data ports.Beside the microprocessor, a complete computer requires a power supply, memory, in-terface circuits to provide ports to external devices, and input/output devices such as akeyboard, display, DACs and ADCs, and magnetic or other (optical) data storage.9.1.2Functional Elements of the ComputerThe functional elements of a computer are the• central processing unit (CPU),169