Honestly, the line between them is fading away. The only practical erasable ROMs were UV-erased EPROMS, electrically erasable PROMS (EEPROMS) were expensive, slow, and not very dense, and "flash" meant the bits of plastic sticking out of the mold seam lines on the chip. Motorola 6801 or Intel 8051) would have peripheral I/O pins (serial ports, parallel I/O, timer I/O, etc.) but no external memory bus (you were stuck with what was on the chip).Īdditionally, microprocessors executed their programs from external ROM and microcontrollers would use internal masked (as in "programmed at the factory by changing the IC photo mask") ROM.
Motorola 6800 or Intel 8086) would have an address bus, a data bus, and control lines, and a microcontroller (e.g.
The terms come from the 1970s, where a microprocessor (e.g. CPU core or cores) with additional peripherals on-chip. A microcontroller is a microprocessor (a.k.a.
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