发明名称 |
Write protection method and apparatus for an EEPROM |
摘要 |
The subject invention provides an apparatus for controllably programming an EEPROM, thereby reducing the likelihood of an inadvertent EEPROM write. The apparatus includes a first circuit which repeatedly produces a pseudo address signal at a preselected frequency. A second circuit receives the pseudo address signal and deliveries a write-enable signal to the EEPROM in response to receiving the pseudo address signal a preselected number of times. A third circuit delivers an address signal and a corresponding data signal to the EEPROM during at least a portion of the production of the write-enable signal. The address signal is indicative of an address location in said EEPROM and the data signal corresponds to the data to be stored in the EEPROM address location.
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申请公布号 |
US5047982(A) |
申请公布日期 |
1991.09.10 |
申请号 |
US19900507809 |
申请日期 |
1990.04.12 |
申请人 |
CATERPILLAR, INC. |
发明人 |
SMITH, VERNON R.;STAHL, ALAN L. |
分类号 |
G11C16/08;G11C16/10;G11C16/22;G11C16/32 |
主分类号 |
G11C16/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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