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FM21LD16 Scheda tecnica(PDF) 6 Page - Ramtron International Corporation |
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FM21LD16 Scheda tecnica(HTML) 6 Page - Ramtron International Corporation |
6 / 14 page FM21LD16 - 128Kx16 FRAM Rev. 1.0 Dec. 2009 Page 6 of 14 Figure 2. Write-Protect State Machine For example, the following sequence write-protects addresses from 0C000h to 13FFFh (sectors 3 & 4): Address Data Read 12555h - Read 1DAAAh - Read 01333h - Read 0ECCCh - Read 000FFh - Read 1FF00h - Write 1DAAAh 18h ; bits 3 & 4 = 1 Write 0ECCCh E7h ; complement of 18h Write 0FF00h - ; Data is don’t care Read 00000h - ; return to Normal Operation |
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