ESMT
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,
F25L32PA
the status register may be read only to determine the completion
of an operation in progress. Table 2 describes the function of
each bit in the software status register.
Table 2: Software Status Register
Bit
Name
Function
1 = Internal Write operation is in progress
0 = No internal Write operation is in progress
1 = Device is memory Write enabled
0 = Device is not memory Write enabled
Indicate current level of block write protection (See Table 3)
Indicate current level of block write protection (See Table 3)
Indicate current level of block write protection (See Table 3)
Reserved for future use
Reserved for future use
1 = BP2,BP1,BP0 are read-only bits
0 = BP2,BP1,BP0 are read/writable
Default at
Power-up
0
0
1
1
1
0
0
0
Read/Write
Status Register
0
1
2
3
4
5
6
7
Note:
1. Only BP0, BP1, BP2 and BPL are writable.
2. All register bits are volatility
3. All area are protected at power-on (BP2=BP1=BP0=1)
BUSY
WEL
BP0
BP1
BP2
RESERVED
RESERVED
BPL
R
R
R/W
R/W
R/W
N/A
N/A
R/W
WRITE ENABLE LATCH (WEL)
The Write-Enable-Latch bit indicates the status of the internal
memory Write Enable Latch. If this 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. This bit is automatically reset
under the following conditions:
•
•
•
•
•
•
•
Power-up
Write Disable (WRDI) instruction completion
Page Program instruction completion
Sector Erase instruction completion
Block Erase instruction completion
Chip Erase instruction completion
Write Status Register instructions
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.
Elite Semiconductor Memory Technology Inc.
Publication Date: Mar. 2009
Revision: 1.0
9/36
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
