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T89C51AC2-RLSI-M 数据表(PDF) 21 Page - ATMEL Corporation |
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T89C51AC2-RLSI-M 数据表(HTML) 21 Page - ATMEL Corporation |
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21 / 117 page ![]() Draft.A - March 30, 2001 21 Preview - Confidential T89C51AC2 7.3.1.3. Hardware security space The Hardware security space is a part of FM0 and has a size of 1 byte. The 4 MSB can be read/written by software, the 4 LSB can only be read by software and written by hardware in parallel mode. 7.3.1.4. Column latches The column latches, also part of FM0, have a size of full page (128 bytes). The column latches are the entrance buffers of the three previous memory locations (user array, XROW and Hardware security byte). |
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