MICROPROCESSOR PROVIDED WITH CPU AND EEPROM

摘要

PURPOSE: To secure the unequivocal reading of the contents of EEPROM even at the time of being operated by higher clock frequency in a microprocessor with the memory of an EEPROM form and a protective device SV. CONSTITUTION: The protective device SV includes a frequency recognizing device FE, which is given a microprocessor clock inputted from outside. Then the clock frequency of a clock signal scheduled for the driving of CPU is reduced in connection with the clock frequency of the detected microprocessor clock. In addition, Then a selective connector SEL is driven so as to transmit a clock given from a clock adjusting unit TKE to CPU only during the read access of the EEPROM memory.