A single chip data processing apparatus having a central processing unit (CPU) and a flash memory constituted by electrically rewritable nonvolatile memory cells. The flash memory can be written with data under the control of the built-in CPU in an external write operation mode of the apparatus...http://www.google.com/patents/US5844843?utm_source=gb-gplus-sharePatent US5844843 - Single chip data processing apparatus having a flash memory which is rewritable under the control of built-in CPU in the external write mode 
