| 摘要 |
A computer system in which an EEPROM incorporated in a power supply control microcomputer can be compulsorily rewritten even in case contents of the EEPROM are destroyed so that a correct power supply control cannot be effected. The EEPROM is divided into two types of blocks, that is, code blocks which are objects to be rewritten and store a power supply control program and boot blocks which are not objects to be rewritten and store a power turn-on program, a key input detection program, and a rewrite request program. When the turn-on or reset of power in the system is effected, the key input detection program stored in the boot blocks is executed to detect the absence or presence of a predetermined key input. If the predetermined key input is detected, then the rewrite request program stored in the boot blocks is executed to rewrite the code blocks. Therefore, even in case the contents of the code blocks are destroyed and, thus, the correct control over the power supply cannot be executed, the rewrite of the code blocks can be compulsorily executed.
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