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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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AT89C5122D-RDRUM 数据表(PDF) 28 Page - ATMEL Corporation |
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AT89C5122D-RDRUM 数据表(HTML) 28 Page - ATMEL Corporation |
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28 / 208 page  28 AT83R5122, AT8xC5122/23 4202F–SCR–07/2008 AT83R5122, AT8xC5122’s ROM Version The AT83R5122, AT8xC5122’s ROM version implements : - 32 K of ROM mapped from 0000h to 7FFFh in which is embedded the user code. The ROM device is only factory programmable. - 512 bytes of E2PROM can be optionally implemented to store permanent data. With this option, the size of ROM is reduced to 30K. After the reset, the MCU begins the execution of the user code from location 0000h of the ROM. Access to external Program Memory is not allowed. Security Level There are two security levels (applicable to High Pin Count packages only) : The security level 2 can be used to protect the user code from piracy. This option is con- figured at factory and must be requested by the customer at order time. Table 9. Security Levels Description Security Level Protection description 1 No protection lock enabled 2 MOVC instruction executed from external Program Memory is disabled when fetching code bytes from internal Program Memory EA is sampled and latched on reset. External code execution is enabled. |
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