Computer Automation in Manufacturing: An introduction by Thomas O. Boucher

By Thomas O. Boucher

o computing device Automation in production supply guideline in laptop structure, interfacing to mechanical structures, and software program improvement for non-stop regulate and discrete occasion platforms. this is often complete by means of featuring theoretical fabric and hands-on laboratory experiments.

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The address bus is used to address all memory locations, both ROM and RAM. e. its current state can be altered by writing A B B ----ll---e-~ ~-+~I-+---t c Xs B A Fig. 22 A l-of-8 decoder. Xg ARCHITECTURE AND OPERATIONS OF MICROPROCESSOR SYSTEM II to it or by turning the power off. RAM is constructed from bistable electronic circuits called flip flops. The output of a flip flop holds the binary data programmed or read into RAM. The output remains stable until the input combinations are changed. 2.

This means that the current state of its output depends on the current state of its input and on the past history of the device. Typical sequential networks in which you will find flip flops are counters, shift registers, and memory registers. One example of a widely used flip flop is the JK flip flop, which is illustrated in Fig. 27. 27a shows the logic circuit, which consists of four AND gates and two NOR gates. The inputs are J and K, outputs are Q and Q. Sequential networks are synchronized by the clock cycle, which is also shown on the input side.

Consider the addition of 1110 and 1100: 1 1 lOX 1 1 0 0 Y 11010 S=X+Y 1 1 carry bits, C When addition is requested by a program instruction, the microprocessor carries it out efficiently using a combinational network called an adding network. The duality between digital circuits and binary arithmetic is nicely illustrated by a circuit that performs the addition of two binary digits (called a half adder). From our previous description of constructing simple circuits from gates, we will derive the network for a half adder from its truth table.

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