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CAT28C256PIA-12T 데이터시트(PDF) 10 Page - ON Semiconductor |
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CAT28C256PIA-12T 데이터시트(HTML) 10 Page - ON Semiconductor |
10 / 14 page CAT28C256 http://onsemi.com 10 To activate the software data protection, the device must be sent three write commands to specific addresses with specific data (Figure 10). This sequence of commands (along with subsequent writes) must adhere to the page write timing specifications (Figure 12). Once this is done, all subsequent byte or page writes to the device must be preceded by this same set of write commands. The data protection mechanism is activated until a deactivate sequence is issued regardless of power on/off transitions. This gives the user added inadvertent write protection on power−up in addition to the hardware protection provided. To allow the user the ability to program the device with an EEPROM programmer (or for testing purposes) there is a software command sequence for deactivating the data protection. The six step algorithm (Figure 11) will reset the internal protection circuitry, and the device will return to standard operating mode (Figure 13 provides reset timing). After the sixth byte of this reset sequence has been issued, standard byte or page writing can commence. Figure 12. Software Data Protection Timing Figure 13. Resetting Software Data Protection Timing AA 5555 55 2AAA A0 5555 DATA ADDRESS BYTE OR PAGE WRITES ENABLED AA 5555 55 2AAA DATA ADDRESS 80 5555 AA 5555 55 2AAA 20 5555 SDP RESET DEVICE UNPROTECTED CE WE tWC CE WE tWP tBLC tWC |
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