| 摘要 |
PROBLEM TO BE SOLVED: To provide a receiver protecting data at the time of illegal access to inner storage information and easily putting a part related to security in an unusable state at the time of abolishment. SOLUTION: An access monitoring part 82 collates an access code requesting access to EEPROM 81 with a regular access code which the part 82 itself has when it receives the code and judges the matching/non-matching of the access codes. When the access codes are matched with each other by the judgment, access to EEPROM 81 is permitted. When they are not matched, the count value of a retry counter 83 is increased by one without permission and it waits again the input of the access code. When the count value arrives at a previously decided value, the retry counter 83 informs the access monitoring part 82 of the arrival. When the access monitoring part 82 judges the non-matching of the access codes after the notice, it deletes data in EEPROM 81. |
