Data processing apparatus having a flash memory built-in which is rewritable by use of external device

摘要

A data processing apparatus having a built-in flash memory and being capable of rewriting the built-in flash memory by use of versatilely used PROM writer has a CPU, an electrically rewritable nonvolatile flash memory both formed in a single semiconductor substrate, and is operable in a mode in which the built-in flash memory is rewritable in accordance with commands supplied from a PROM writer. The data processing apparatus has a command latch made externally writable when the above-mentioned operation mode is established, a command analyzer and a sequence controller for controlling a sequence of rewriting the flash memory in accordance with the analysis result. The command analyzer and sequence controller may be realized by the CPU.