A fully 16-bit external data bus 68000-microprocessor is used in the following m

Question

A fully 16-bit external data bus 68000-microprocessor is used in the following motor control and instrumentation system. It operates as follows: 1. An operator prepares an 8-bit binary value with a dip switch. 2. A momentary contact switch (single-pole-single throw) connected to only one end of a cross-coupled NAND latch is activated. This sets the output of the latch to a logic one. 3. All this time, the 68000 has been polling the output of the latch. 4. When microprocessor detects a logic one at the output of the latch, it resets the latch to a logic zero by sending a low going pulse to the other input leg of the latch. 5. The microprocessor then reads the 8-bit data from the dip switch and puts the value in memory starting at location called

Explanation / Answer

A microprocessor incorporates the functions of a computer's central processing unit (CPU) on a single integrated circuit (IC),or at most a few integrated circuits. It is a multipurpose, programmable device that accepts digital data as input, processes it according to instructions stored in its memory, and provides results as output. It is an example of sequential digital logic, as it has internal memory. Microprocessors operate on numbers and symbols represented in the binary numeral system. The advent of low-cost computers on integrated circuits has transformed modern society. General-purpose microprocessors in personal computers are used for computation, text editing, multimedia display, and communication over the Internet. Many more microprocessors are part of embedded systems, providing digital control of a myriad of objects from appliances to automobiles to cellular phones and industrial process control.

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