Understanding Microprocessors by B. S. Walker (auth.)

By B. S. Walker (auth.)

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So long as the correct switching off procedures are observed the data contained at switch off remains uncorrupted for an indefinite period. This allows programs of a sem i-permanent nature, such as operating systems, to remain safely within the store on switch off or power down; however when co re stores are in operation they are quite fast random access stores. Mieroelectronie random access stores are cheap. They are so cheap that a mieroprocessor can usually be furnished with an the random access store it needs.

So long as the correct switching off procedures are observed the data contained at switch off remains uncorrupted for an indefinite period. This allows programs of a sem i-permanent nature, such as operating systems, to remain safely within the store on switch off or power down; however when co re stores are in operation they are quite fast random access stores. Mieroelectronie random access stores are cheap. They are so cheap that a mieroprocessor can usually be furnished with an the random access store it needs.

1 8 bits 40 Understanding Microprocessors The planar fabrication technique and limitations on pin-out considerably circumscribe the options open to the chip designer as was stressed earlier. lt is difficult and uneconomic to provide multiple highways. Registers, so long as they are arrays of the simplest storage elements take up little space and are comparatively easy to design and implement. Registers having built-in logic function capability are more costly and difficult. So called 'random logic' networks of arbitrary configurations of various kinds of logic elements, are still more difficult and take up an uneconomical amount of space on the limited surface of a chip.

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