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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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24LCS52-/MC Fiches technique(PDF) 9 Page - Microchip Technology |
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24LCS52-/MC Fiches technique(HTML) 9 Page - Microchip Technology |
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9 / 28 page  © 2005 Microchip Technology Inc. DS21166J-page 9 24AA52/24LCS52 6.0 WRITE PROTECTION The 24XXX52 has a software write-protect feature that allows the lower half of the array (addresses 00h-7Fh) to be permanently write-protected, as well as a WP pin that can be used to protect the entire array. 6.1 Software Write-Protect The software write-protect feature is invoked by writing to the write-protect register. This is done by sending a command similar to a normal Write command. As shown in Figure 6-1, the write-protect register is written by sending a Write command with the slave address set to ‘0110’ instead of ‘1010’ and the address bits and data bits are “don’t cares.” Once the software write-protect register has been written, the device will not acknowledge the ‘0110’ control byte. FIGURE 6-1: SETTING WRITE-PROTECT REGISTER 6.2 Resetting the Software Write-Protect Fuse It is possible to reset the software write-protect feature on the 24XXX52. This is done by sending a command similar to setting the software write-protect command, except the command is sent before the regular control byte and is ‘1001’ . The full command will be shown in Figure 6-2. In order for the command to work, a voltage of Vcc + 5.5V must be applied to the WP pin and must be sustained for 1 μS before the command is given. The customer should also allow for a 5 ms delay after the Stop bit for TWC. S P Bus Activity Master SDA Line Bus Activity S T A R T S T O P Control Byte Word Address Data A C K A C K A C K 00 1 1 |
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