By R. J. Mitchell (auth.)
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Extra info for Microprocessor Systems: An Introduction
A simple processor. The ROM and RAM. Standard memory devices which can contain programs and/or data. Seven-segment displays. 8 in which there are typically 8 lights! Seven of these form segments which may be illuminated appropriately so as to produce patterns of numbers, the eighth is a dot which is often to the left of the number. The device has 8 binary inputs, one for each light, and (for many such devices) an input should be a logic 0 for its associated segment to be lit. A keypad. This has 16 keys on it, and 5 output signals which indicate the state of the keypad.
1 Logic gates and their operation If a logic signal is called a, then a is '1' is represented by a, and a is '0' is NOT (a), which can be written i The + operator is used to designate OR, and a dot, or sometimes no symbol at all, is used to represent AND. Note the + operator should not be confused with addition: 1 + 1 means true once, not twice! b The output of an AND gate is '1' if all its inputs are '1 '; the output of an OR gate is '1 ', if at least one of its inputs is 'I'; the output of a NAND is '0' if all its inputs are 'I ', and so on.
This is capable of showing text and graphics. A mouse. This allows input of graphical data, and for selection from lists. A floppy disk. For storing data and for loading information. A hard disk. For storing larger amounts of data. Modern software is large and extensive; a lOOM disk will fill up quickly. Some modern systems also have a CD ROM for reading large amounts of information. Communication ports. A parallel printer link and a serial communications link are both useful. In addition, a connection to a local area network can be invaluable.
Microprocessor Systems: An Introduction by R. J. Mitchell (auth.)