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Is it possible that FWP of microcomputer is connected with the I/O port?

Latest Updated:03/25/2009

Question:

Is it possible that the FWP(FWE) pins of microcomputer with on-chip flash is connected with the I/O port, and control rewriting the flash with software?

Answer:

It is fundamentally possible.

However, FWP(FEW) pins are the pins to protect the incorrect write/erase to the on-chip flash with hardware. 

When switching FWP(FEW) pins by the I/O port control with software, it is possible that on-chip flash can be rewritten /erased unexpectedly because of false operation of CPU, software bugs, and so on. Therefore, please make a system design after examining it enough.

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