Patent ID: 6349397
Filing Date: 2002-02-19
Classification: G01R,G06F,G11C

Abstract:
A signal processing apparatus having at least a boundary scan chain for carrying out a boundary scan test, a central processing unit capable of being controlled by the boundary scan chain, a non-volatile memory for storing an operating program of the central processing unit and necessary data, and an input terminal for inputting data and other control signals from the outside to the boundary scan chain; whereinsaid signal processing apparatus further comprises: a register for holding data transferred from the boundary scan chain and being read for the held data by the central processing unit and a memory for holding the data read from the register; a rewriting program is input via the input terminal from a writing device to the boundary scan chain and then stored in the memory through the register during data rewriting based on the control of the boundary scan chain; and the central processing unit inputs rewriting data through the input terminal and the boundary scan chain to write it into the non-volatile memory based on the control of the rewriting program stored in the memory.