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In Harvard architecture, memory of data and memory of instruction are separated. Its advantages includes, faster execution time:it allow concurrent access of data and instruction andÊÊaccommodates Êmemories ÊfromÊdifferent technologies.

Atmel's family say that 8051 controller follows the von-nuemann architecture. because register to register operation not possible in all 8051 family. if it is harvard means, it must support register to register transfer.Hence it concludes that 8051 followed by von-nuemann or Princeton architecture...

Harvard Graduate School of Design is a good learning institution to learn a degree program in Architecture.

In the Von Neumann (not "von humann") architecture instructions and data share the same bus and address space, while in the Harvard architecture instructions and data are accessed through separate buses.