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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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COP8CCR9KMT7 数据表(PDF) 22 Page - National Semiconductor (TI) |
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COP8CCR9KMT7 数据表(HTML) 22 Page - National Semiconductor (TI) |
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22 / 84 page  10.0 Functional Description (Continued) 10.4.1 Virtual EEPROM The Flash memory and the User ISP functions (see Section 5.7), provide the user with the capability to use the flash program memory to back up user defined sections of RAM. This effectively provides the user with the same nonvolatile data storage as EEPROM. Management, and even the amount of memory used, are the responsibility of the user, however the flash memory read and write functions have been provided in the boot ROM. One typical method of using the Virtual EEPROM feature would be for the user to copy the data to RAM during system initialization, periodically, and if necessary, erase the page of Flash and copy the contents of the RAM back to the Flash. 10.5 OPTION REGISTER The Option register, located at address 0x7FFF in the Flash Program Memory, is used to configure the user selectable security, WATCHDOG, and HALT options. The register can be programmed only in external Flash Memory programming or ISP Programming modes. Therefore, the register must be programmed at the same time as the program memory. The contents of the Option register shipped from the factory read 00 Hex. 10137410 FIGURE 7. RAM Organization www.national.com 22 |
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