| 摘要 |
PURPOSE: A self-test device and method in a micro processor is provided to compare a check sum, which is generated when a data writing process and stored in a ROM, with other check sum generated when authorizing a power and to display a status of a microprocessor according to the comparison. CONSTITUTION: A self-test device in a micro processor has an input unit(10), an oscillation unit(20), a micro processor(30), an output unit(40) and a display unit(50). The input unit(10) inputs a data inputted from the external. The oscillation unit(20) generates a standard clock signal according to the input data. After writing an input data of the input unit(10) into a user s ROM(read only memory), the micro processor(30) outputs a control signal. The output unit(40) decides an operation or not according to the output signal generated from the micro processor(30). The display unit(50) decides a lighting or not according to the output signal generated from the micro processor(30). The micro processor(30) compares a check sum data stored in a constant fill area of user s ROM with a check sum data generated by increasing an address of user s ROM.
|
