| 摘要 |
PROBLEM TO BE SOLVED: To surely hold the storage contents of a storage means and to surely clear them in a game machine by which data are preserved in the storage means which is backed-up in power source even in the case of power interruption in the game machine and also data are cleared by interrupting a back-up power source. SOLUTION: A capacitor 909 is connected between the back-up power source terminal of a CPU 56 and the ground. The capacity of the capacitor 909 is the one by which the contents of a RAM are held for several seconds when the back-up power source is interrupted. The capacity is about 1000 pF-0.1μF (corresponding to the holding time of about 1-4 seconds) in the CPU 56 to be used for the game machine. The value is smaller than the capacity of the capacitor 908 connected to a power source terminal (VDD terminal).
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