Verfahren zur Selbstdiagnose eines mobilen Fernsprechapparats zum Gebrauch in einem mobilen Fernsprechvermittlungssystem und auf dieses Verfahren angewandeter Fernsprechapparat

摘要

The present invention relates to a self-diagnosing method which shortens the diagnosing time for a ROM which is provided within a mobile telephone set for use in a mobile telephone switching system and mobile telephone set being applied the method. When the power supply is turned ON, a complementary value which complements to set up the sum of data stored within all the addresses of the ROM as a certain specific value, ROMCHK, which is the content of the data stored within a specific address of the ROM, is compared with NVMCHK which is the content of data stored previously within a specific address of a non-volatile memory with the same value as the ROMCHK. If they do not coincide, then the content of the data within the entire area of the ROM is calculated for the diagnosis. In this case, the content stored within the specific address of the ROM is the sum of the data values within the entire area of the ROM, and the content stored within the specific address of the non-volatile memory is the same as this sum value.