发明名称 |
Protection circuit for a microprocessor |
摘要 |
Electronic devices using microprocessors requiring additional external memory can have security protection for the microprocessors while in an expanded mode of operation. A microprocessor having a security access circuit allows executable code to be stored in a peripheral storage device, such as external EPROM, while maintaining protection to the microprocessor EEPROM by monitoring if an instruction code is generated from an internal memory source or an external memory source.
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申请公布号 |
US5557743(A) |
申请公布日期 |
1996.09.17 |
申请号 |
US19940223484 |
申请日期 |
1994.04.05 |
申请人 |
MOTOROLA, INC. |
发明人 |
POMBO, RAUL;BORRAS, JAIME;BRON, MICHEL |
分类号 |
G06F12/14;G11C8/20;(IPC1-7):G06F11/34 |
主分类号 |
G06F12/14 |
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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