The attribute shared by most embedded controllers is their ability to interact withthe outside world. While this fact is generally accepted, the form this I/O takesincludes everything from parallel and bitaddressable digital I/O, analog I/O, as well as complex functions such as a user interface panel. Furthermore, timingrelated activities such as pulse width modulation, pulse accumulation, frequencymeasurement, and duty cycle and phase determination are often lumped together under the heading of high speed I/O. Additionally, while not necessarily I/O related, many small systems will benefit from other functional extensions involving real time clocks, interval timers, and nonvolatile memories.
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