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CAT150169MWI-GT3 Datasheet(PDF) 8 Page - ON Semiconductor |
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CAT150169MWI-GT3 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 15 page CAT15008, CAT15016 Doc. No. MD-1125 Rev. B 8 © 2008 SCILLC. All rights reserved. Characteristics subject to change without notice WRITE OPERATIONS The CAT15008/16 device powers up into a write disable state. The device contains a Write Enable Latch (WEL) which must be set before attempting to write to the memory array or to the status register. In addition, the address of the memory location(s) to be written must be outside the protected area, as defined by BP0 and BP1 bits from the status register. Write Enable and Write Disable The internal Write Enable Latch and the corresponding Status Register WEL bit are set by sending the WREN instruction to the CAT15008/16. Care must be taken to take the CS ¯¯ input high after the WREN instruction, as otherwise the Write Enable Latch will not be properly set. WREN timing is illustrated in Figure 4. The WREN instruction must be sent prior any WRITE or WRSR instruction. The internal write enable latch is reset by sending the WRDI instruction as shown in Figure 5. Disabling write operations by resetting the WEL bit, will protect the device against inadvertent writes. Figure 4. WREN Timing Note: Dashed Line = mode (1, 1) - - - - - - Figure 5. WRDI Timing Note: Dashed Line = mode (1, 1) - - - - - - SCK SI CS SO 000 0 0 11 0 HIGH IMPEDANCE SCK SI CS SO 0 0 000 10 0 HIGH IMPEDANCE |
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