Microprocessors Essay

2655 words - 11 pages

Inside of the mysterious box that perches ominously on your desk is one of the marvels of the modern world. This marvel is also a total enigma to most of the population. This enigma is, of course, the microprocessor. To an average observer a microprocessor is simply a small piece of black plastic that is found inside of almost everything.In How Microprocessors Work they are defined as a computer's central processing unit, usually contained on a single integrated circuit (Wyant and Hammerstrom, 193). In plain English this simply means that a microprocessor is the brain of a computer and it is only on one chip. Winn L. Rosch compares them to being an electronic equivalent of a knee-joint that when struck with the proper digital stimulus will react in the exact same way each time (Rosch,37). More practically a microprocessor is multitudinous transistors squeezed onto as small a piece of silicon as possible to do math problems as fast as possible.Microprocessors are made of many smaller components which all work together to make the chip work. A really good analogy for the way the inner workings of a chip operate can be found in How Microprocessors Work. In their book, Wyant and Hammerstrom describe a microprocessor as a factory and all of the inner workings of the chip as the various parts of a factory (Wyant and Hammerstrom, 71-103). Basically a microprocessor can be seen as a factory because like a factory it is sent something and is told what to do with it. The microprocessor factory processes information. This most basic unit of this information is the bit. A bit is simply on or off. It is either a one or a zero. Bits are put into 8 bit groups called bytes. The number 8 is used because it is offers enough combinations to encode our entire language (2^8=256). If only 4 bits are used only (2^4=16) combinations would be possible. This is enough to encode 9 digits and some operations. (The first microprocessors powered calculators) A half byte is called a nibble and consists of 4 bits. In the world of computer graphics the combination of bits is easier seen. In computer graphics bits are used to make color combinations, thus with more bits more colors are possible. Eight bit graphics will display 256 colors, 16 bit will display 65,536, and 24 bit graphics will display 16.7 million colors. The bus unit is described as the shipping dock because it controls data transfers, and functions between the individual pieces of the chip. The part of the chip that performs the role of a purchasing department is called the prefetch unit. It's job is to make certain that enough data is on hand to keep the chip busy. The decode unit performs the role of a receiving department. It breaks done complicated instructions from the rest of the computer into smaller pieces that the chip can manipulate more readily. The control unit is compared to the person who oversees the workings of the entire factory. It is the part of the chip that keeps all the other parts working...

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