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Designing Embedded Systems with PIC Microcontrollers, 2nd Edition by Tim Wilmshurst

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CHAPTER 3. Parallel ports, power supply and the clock oscillator
So far we have looked a little at the theory of microcontroller architecture and its implementation in PIC microcontrollers. This chapter now begins to move from that theory to the practice of small-scale hardware design.
As we have seen, the microcontroller core has internal data and address buses. In a way these are like motorways, or inter-state freeways, carrying large amounts of traffic in both directions to a variety of different destinations. The microcontroller needs to be provided with a way of allowing that data flow to connect with the outside world, so that it can read in external digital values or output other values. In other words, it needs the equivalent of motorway ...

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