Addition to Von Neumann Computer Architecture | itfasilkom.blogspot.com

• Harvard Architecture

Harvard Architecture is used on the first computer in the world with the name of The Harvard Mark I. Created in 1944 at Harvard University by Howard Aiken corporation with IBM. Harvard architecture is the machine electromechanical transistor made of many tubes and relays.

The machine that made a calculating machine which is controlled by paper tape containing the instructions, and not wearing memory. Architecture Harvard has two separate memory is RAM ( Random Access Memory ) and ROM ( Read Only Memory ).

Example usage Architecture Harvard :

1. Intel 80C51
2. Microchip family PIC16XX
3. Philip and Atmel AT89LSXX P87CLXX

Excess Harvard Architecture

Width of program memory bits are not the same as the width of the data memory as program memory bandwidth (16 bits). The op code and operand can be put together in a single instruction word. The goal is that instruction can be done more quickly.

Separate program and data memory, then plots the total program and data memory can be a lot more.

Lack Harvard Architecture

Unable to put the data in ROM, but this can be overcome by making instructions and a special mechanism for addressing the data in ROM. Microprocessors that have instructions like this is called the Modified Harvard Architecture. That such instruction can be found on the MCS-51 Family including Intel 80C51, P87CLXX from Philips and Atmel AT89LSXX