MCU architecture

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CISC is a Complex Instruction Set Computer.
It is a MCU that can address a large number of instructions.

In the early 1980s, computer designers recommended that MCU should use fewer instructions with simple constructs so that they can be executed much faster within the MCU without having to use memory.
Such MCU are classified as Reduced Instruction Set Computer or RISC.


The following points differentiate a CISC from a RISC

(From: Embedded_Systems)

Von-Neumann Architecture and Harvard Architecture

Von-Neumann Architecture use only one bus for access to the data and to the code

Harvard Architecture use two or more separate buses for access to the data and to the code

Von-Neumann Architecture vs Harvard Architecture

(From: Embedded_Systems)