Patent ID: 6230291
Filing Date: 2001-05-08
Classification: G06F

Abstract:
A microcomputer possessing a test function, comprising:user program storage means for storing a user program serving for the use of the user;test program storage means for storing a test program for realizing said test function;test mode setting means for setting a test mode for carrying out a burn-in test of said microcomputer;mode switching means connected to said test mode setting means and a switching signal terminal supplied with a switching signal, and switching between a user program access mode for gaining access to said user program storage means and a test program execution mode for executing said test program stored in said test program storage means, when said test mode is set in the test mode setting means;user program access means coupled to said mode switching means and for gaining access to a storage area in said user program storage means when said user program access mode is set in the mode switching means; andtest program execution means coupled to said mode switching means and for executing said test program when said test program execution mode is set in said mode switching means,wherein said mode switching means includes frequency division means for changing an output state for every input of said switching signal, andwherein said user program access mode and said test program execution mode are switched by the output state of the frequency division means.