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25AA640 Datasheet(PDF) 10 Page - Microchip Technology |
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25AA640 Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 24 page  25AA640/25LC640 DS21223H-page 10 © 2008 Microchip Technology Inc. 3.5 Read Status Register Instruction (RDSR) The Read Status Register instruction (RDSR) provides access to the STATUS register. The STATUS register may be read at any time, even during a write cycle. The STATUS register is formatted as follows: The Write-In-Process (WIP) bit indicates whether the 25XX640 is busy with a write operation. When set to a ‘1’, a write is in progress, when set to a ‘0’, no write is in progress. This bit is read-only. The Write Enable Latch (WEL) bit indicates the status of the write enable latch. When set to a ‘1’, the latch allows writes to the array and STATUS register, when set to a ‘0’, the latch prohibits writes to the array and STATUS register. The state of this bit can always be updated via the WREN or WRDI commands regardless of the state of write protection on the STATUS register. This bit is read-only. The Block Protection (BP0 and BP1) bits indicate which blocks are currently write-protected. These bits are set by the user issuing the WRSR instruction. These bits are nonvolatile. See Figure 3-6 for RDSR timing sequence. FIGURE 3-6: READ STATUS REGISTER TIMING SEQUENCE 7 654 3 2 1 0 WPEN X X X BP1 BP0 WEL WIP SO SI CS 9 1011 12 1314 15 11 0 0 0 0 00 765 4 2 1 0 Instruction Data from STATUS Register High-Impedance SCK 0 2 3 4567 18 3 |
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Similar Description - 25AA640_08 |
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