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24LC320-ISN Datasheet(PDF) 6 Page - Microchip Technology |
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24LC320-ISN Datasheet(HTML) 6 Page - Microchip Technology |
6 / 12 page 25LC320 DS21158B-page 6 Preliminary © 1996 Microchip Technology Inc. FIGURE 2-1: WRITE TO STATUS REGISTER AND/OR ARRAY FLOWCHART CS Returns High Continue WEL = 1? WEL = 1? WP is low? WPEN = 1? Write Write to Status Register Do not write to Status Register Write to the Unprotected Block Do not write to Array No No No No Yes Yes Yes Yes No Yes No Yes To other Commands From other Commands Write to Status Reg? to array? 2.3 Write Status Register (WRSR) The WRSR instruction allows the user to select one of four protection options for the array by writing to the appropriate bits in the status register. The array is divided up into four segments. The user has the ability to write protect none, one, two, or all four of the seg- ments of the array. The partitioning is controlled as illus- trated in Table 2-3. See Figure 3-6 for WRSR timing sequence. TABLE 2-3: ARRAY PROTECTION BP1 BP0 Array Addresses Write Protected 0 0 none 0 1 upper 1/4 0C00h - 0FFFh 1 0 upper 1/2 0800h - 0FFFh 1 1 all 0000h - 0FFFh |
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