Data processor

Abstract

To obtain a correct vector address even if an interrupt occurs during erasing or programming of the data in a built-in ROM 18 by moving a part of a built-in RAM13 to a vector address area by a bus controller 27. Thereby, a microcomputer is prevented from running away and the safety of a system is improved at the time of on-board programming of the built-in ROM 18.

1 - 5 . (canceled)  
   
   
       6 . A data processing unit formed on a semiconductor substrate, comprising: 
 a non-volatile memory adapted to electrically erase or program data into the non-volatile memory;    a central processing unit accessing the non-volatile memory; and    a control circuit;    wherein the data processing unit is capable of operating in a boot mode or an active mode;    wherein the control circuit terminates a process for erasing or programming of data into the non-volatile memory in response to an interrupt request or an exception processing request to the central processing unit, when the non-volatile memory is erasing or programming data in the boot mode; and    wherein the data processing unit operates in part to input data from outside the data processing unit for programming in the non-volatile memory in the boot mode.    
   
   
       7 . A data processing unit according to  claim 6 , 
 wherein the data processing unit comprises an interface unit for inputting or outputting data, and    wherein the interface unit inputs data for programming in the non-volatile memory from outside of the data processing unit in the boot mode.    
   
   
       8 . A data processing unit according to  claim 7 , 
 wherein the data processing unit executes data for programming of the non-volatile memory in the active mode.