Compare Microprocessor and Microcontroller.

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MicroprocessorMicrocontroller
Microprocessor contains
ALU,general purpose
registers,stack
pointer,
program counter, clock timing
circuit and interrupt
circuit.
Microcontroller contains the circuitry
of microprocessor and in
addition it
has built- in ROM, RAM, I/O
devices, timers and
counters.
It has many instructions to
move data between memory
and CPU.
It has one or two instructions to move
data between memory and
CPU.
It has one or two bit handling
instructions.
It has many bit handling instructions.
Access times for memory and I/O
devices are more.
Less access times for built-in memory
and I/O devices.
Microprocessor based system
requires more hardware.
Microcontroller based system requires
less hardware reducing PCB
size and
increasing the reliability.

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