Discussion
Three of the following are normally integrated on a microcontroller. The exception is
Answer: A
Correct answer: a hard disk controller
A microcontroller integrates what an embedded application needs on one chip: flash, RAM, timers, converters, serial ports and general purpose I/O. A hard disk controller belongs to a class of system a microcontroller is not built for - embedded storage is flash or an SD card over SPI, and the mass-storage interface would dwarf the rest of the device.
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