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Digital Electronics: Principles, Devices and Applications

Digital Electronics: Principles, Devices and Applications

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566 <strong>Digital</strong> <strong>Electronics</strong>ROMEEPROMRAMMicroprocessorSerialI/OA/DConverterD/AConverterInput<strong>and</strong>OutputPortsInput<strong>and</strong>OutputPortsParallelI/OTimerPWM(a)ROMEEPROMRAMA/DConverterCPUCoreSerialI/OParallelI/OTimerMicrocontrollerPWM(b)Figure 14.1 Microprocessor versus microcontroller: (a) microprocessor configuration; (b) microcontrollerconfiguration.unit with some general-purpose registers. A microprocessor-based system also has RAM, ROM, I/Oports <strong>and</strong> other peripheral devices to make it a complete functional unit, but all these componentsare external to the microprocessor chip. While a microprocessor-based system is a general-purposesystem that may be programmed to do any of the large number of functions it is capable of doing,

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