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M58CR064C Datasheet(PDF) 21 Page - STMicroelectronics |
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M58CR064C Datasheet(HTML) 21 Page - STMicroelectronics |
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21 / 70 page  21/70 M58CR064C, M58CR064D, M58CR064P, M58CR064Q Once set High, the VPP Status bit can only be reset Low by a Clear Status Register command or a hardware reset. If set High it should be reset be- fore a new Program or Erase command is issued, otherwise the new command will appear to fail. Program Suspend Status Bit (SR2). The Pro- gram Suspend Status bit indicates that a Program operation has been suspended in the addressed block. When the Program Suspend Status bit is High (set to ‘1’), a Program/Erase Suspend com- mand has been issued and the memory is waiting for a Program/Erase Resume command. The Pro- gram Suspend Status should only be considered valid when the Program/Erase Controller Status bit is High (Program/Erase Controller inactive). SR2 is set within 5µs of the Program/Erase Sus- pend command being issued therefore the memo- ry may still complete the operation rather than entering the Suspend mode. When a Program/Erase Resume command is is- sued the Program Suspend Status bit returns Low. Block Protection Status Bit (SR1). The Block Protection Status bit can be used to identify if a Program or Block Erase operation has tried to modify the contents of a locked block. When the Block Protection Status bit is High (set to ‘1’), a Program or Erase operation has been at- tempted on a locked block. Once set High, the Block Protection Status bit can only be reset Low by a Clear Status Register com- mand or a hardware reset. If set High it should be reset before a new command is issued, otherwise the new command will appear to fail. Reserved Bit (SR0). SR0 is reserved. Its value must be masked. Table 8. Status Register Bits Note: Logic level ’1’ is High, ’0’ is Low. Bit Name Type Logic Level Definition SR7 P/E.C. Status Status ’1’ Ready ’0’ Busy SR6 Erase Suspend Status Status ’1’ Erase Suspended ’0’ Erase In progress or Completed SR5 Erase Status Error ’1’ Erase Error ’0’ Erase Success SR4 Program Status Error ’1’ Program Error ’0’ Program Success SR3 VPP Status Error ’1’ VPP Invalid, Abort ’0’ VPP OK SR2 Program Suspend Status Status ’1’ Program Suspended ’0’ Program In Progress or Completed SR1 Block Protection Status Error ’1’ Program/Erase on protected Block, Abort ’0’ No operation to protected blocks SR0 Reserved |
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