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

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CHAPTER 7. Larger Systems and the PIC 16F873A
Over the previous five chapters the PIC 16F84A has been used as the example microcontroller. It, and other microcontrollers like it, are fine devices for the smaller product. However, there are many things they cannot do, and for more demanding applications we need to look to a more powerful microcontroller. But what does ‘more powerful’ actually mean? Remember what was said in Chapter 1, that a microcontroller is essentially made up of:
Microprocessor core plus memory plus peripherals
More ‘power’ can be added to a microcontroller by enhancing any of these areas. The core, containing the CPU, can be made more powerful by making it faster or enhancing the internal architecture or instruction set. ...

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