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F25L008A-100PAG Datasheet(PDF) 8 Page - Elite Semiconductor Memory Technology Inc. |
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F25L008A-100PAG Datasheet(HTML) 8 Page - Elite Semiconductor Memory Technology Inc. |
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8 / 32 page  ESMT F25L008A Elite Semiconductor Memory Technology Inc. Publication Date: Jul. 2008 Revision: 1.6 8/32 Status Register The software status register provides status on whether the flash memory array is available for any Read or Write operation, whether the device is Write enabled, and the state of the memory Write protection. During an internal Erase or Program operation, the status register may be read only to determine the completion of an operation in progress. Table 4 describes the function of each bit in the software status register. TABLE 4: SOFTWARE STATUS REGISTER Bit Name Function Default at Power-up Read/Write 0 BUSY 1 = Internal Write operation is in progress 0 = No internal Write operation is in progress 0 R 1 WEL 1 = Device is memory Write enabled 0 = Device is not memory Write enabled 0 R 2 BP0 Indicate current level of block write protection (See Table 5) 1 R/W 3 BP1 Indicate current level of block write protection (See Table 5) 1 R/W 4 BP2 Indicate current level of block write protection (See Table 5) 1 R/W 5 RESERVED Reserved for future use 0 N/A 6 AAI Auto Address Increment Programming status 1 = AAI programming mode 0 = Byte-Program mode 0 R 7 BPL 1 = BP2,BP1,BP0 are read-only bits 0 = BP2,BP1,BP0 are read/writable 0 R/W Note1 : Only BP0,BP1,BP2 and BPL are writable Note2 : All register bits are volatility Note3 : All area are protected at power-on (BP2=BP1=BP0=1) Busy The Busy bit determines whether there is an internal Erase or Program operation in progress. A “1” for the Busy bit indicates the device is busy with an operation in progress. A “0” indicates the device is ready for the next valid operation. Write Enable Latch (WEL) The Write-Enable-Latch bit indicates the status of the internal memory Write Enable Latch. If the Write-Enable-Latch bit is set to “1”, it indicates the device is Write enabled. If the bit is set to “0” (reset), it indicates the device is not Write enabled and does not accept any memory Write (Program/ Erase) commands. The Write-Enable-Latch bit is automatically reset under the following conditions: • Power-up • Write-Disable (WRDI) instruction completion • Byte-Program instruction completion • Auto Address Increment (AAI) programming reached its highest memory address • Sector-Erase instruction completion • Block-Erase instruction completion • Chip-Erase instruction completion • Write-Status-Register instructions |
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