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Article: Rolling-code generator uses flash [micro]C.(Technology Tutorial)
- Article from:
- EDN
- Article date:
- May 3, 2001
- Author:
CopyrightCOPYRIGHT 2001 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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MANY SECURITY-ALARM SYSTEMS require the use of a random number. A computer program uses this random number to create a sequence of random numbers to prevent unwanted visitors from gaining entry into a protected facility. You can use a "rolling-code generator" to produce random numbers. To implement such a generator, you would typically need a microcontroller with external memory. Instead, you can use National Semiconductor's COP8SBR flash [micro]C with "virtual-EEPROM" technology. This technology allows you to use a section of flash memory as if it were EEPROM. Because this [micro]C is a true-flash device, the maximum number of erase/ write cycles is typically 100,000 ...
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