Initial process system after cutoff of power source and corresponding process system

Claim 1

In a system having a plurality of electric appliances, a processor means for executing an initial process for said system and for executing a main process to control said electric appliances in accordance with a predetermined program and changeable set data, wherein the initial and main processings are executed when a reset signal generated by supplying an electric power to said system is applied to said processor, said system comprises: (1) a random access memory (RAM) for storing and reading the data while electric power is being supplied, (2) a read only memory (ROM) for storing data and programs in a non-destructive way, storing: a. an initial program for executing the initial process, b. main program for executing the main process, c. first data for being read out by said processor means while said processor means is running the initial program, d. initial data of the set data stored in said random access memory (RAM), for being read out by said processor means while said processor means is running the main program, said RAM storing said set data which are read out by said processor means while said processor means is running the main program, and storing second data which are moved by said processor means while said processor means is running the main program, said second data being equal to said first data, said set data being used for controlling said electric appliances by said porcessor means while said processor means is running the main program, said set data being operable to be changed by a system user while the main program is running, (3) backup means for keeping supplying the electric power to said RAM for at least a predetermined period after cutting off the electric power, said initial program having the following four steps and being run by said processor means when the reset signal is received by said processor means: first step for initializing said processor means, second step, followed after said first step, for reading out said first data and said second data and then judging coincidence of the first and second data, third step, followed after said second step, for running the main progrom when the first data are equal to the second data, and fourth step, followed after said second step, for changing the set data in said RAM to the initial data in said ROM and then running the main program when the first data are not equal to second data, said main program being run by said processor means after the initial program to thereby change the set data in said RAM and control the operation of said electric appliances in accordance with said set data of said RAM, wherein when the reset signal is applied to said processor means while less electric power is applied to said RAM, the set data stored in said RAM is changed to the initail data in said ROM and then said processor means runs the main program and starts to control the operation of said system in accordance with the set data of said RAM, and when the reset signal is applied to said processor means while an electric power is applied to said RAM, said processor means runs the main program and starts to control the operation of said system in accordance with the set data in said RAM.