Datasheet

©2013 Silicon Storage Technology, Inc. DS20005054C 04/13
7
2 Mbit SPI Serial Flash
SST25VF020B
Data Sheet
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 pro-
tection. During an internal Erase or Program operation, the status register may be read only to deter-
mine the completion of an operation in progress. Table 3 describes the function of each bit in the
software status register.
Software Status Register 1
The Software Status Register 1 is an additional register that contains Top Sector and Bottom Sector
Protection bits. These register bits are read/writable and determine the lock and unlock status of the
top and bottom sectors.
Table 4 describes the function of each bit in the Software Status Register 1.
Table 3: 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
0R
1 WEL 1 = Device is memory Write enabled
0 = Device is not memory Write enabled
0R
2 BP0 Indicates current level of block write protection (See Table
5)
1R/W
3 BP1 Indicates current level of block write protection (See Table
5)
1R/W
4:5 RES Reserved for future use 0 N/A
6 AAI Auto Address Increment Programming status
1 = AAI programming mode
0 = Byte-Program mode
0R
7 BPL 1 = BP1, BP0 are read-only bits
0 = BP1, BP0 are read/writable
0R/W
T3.0 25054
Table 4: Software Status Register 1
Bit Name Function
Default at
Power-up Read/Write
0:1 RES Reserved for future use 0 N/A
2 TSP Top Sector Protection status
1 = Indicates highest sector is write locked
0 = Indicates highest sector is Write accessible
0R/W
3 BSP Bottom Sector Protection status
1 = Indicates lowest sector is write locked
0 = Indicates lowest sector is Write accessible
0R/W
4:7 RES Reserved for future use 0 N/A
T4.0 25054