Rainbow Electronics AT25DL161 - Manual (Page 36)

36 AT25DL161 [DATASHEET]
8795E–DFLASH–12/2012
Notes: 1. Only bits 4 and 3 of Status Register Byte 2 will be modified when using the Write Status Register Byte 2
command.
2. R/W = Readable and Writeable
R = Readable only
11.1.1 SPRL Bit
The SPRL bit is used to control whether the Sector Protection Registers can be modified or not. When the SPRL bit is in
the Logical 1 state, all Sector Protection Registers are locked and cannot be modified with the Protect Sector and
Unprotect Sector commands (the device will ignore these commands). In addition, the Global Protect and Global
Unprotect features cannot be performed. Any sectors that are presently protected will remain protected and any sectors
that are presently unprotected will remain unprotected.
When the SPRL bit is in the Logical 0 state, all Sector Protection Registers are unlocked and can be modified (the
Protect Sector and Unprotect Sector commands, as well as the Global Protect and Global Unprotect features, will be
processed as normal). The SPRL bit defaults to the Logical 0 state after device power-up. The Reset command has no
effect on the SPRL bit.
The SPRL bit can be modified freely whenever the WP pin is deasserted. However, if the WP pin is asserted, then the
SPRL bit may only be changed from a Logical 0 (Sector Protection Registers are unlocked) to a Logical 1 (Sector
Protection Registers are locked). In order to reset the SPRL bit back to a Logical 0 using the Write Status Register Byte
1 command, the WP pin has to first be deasserted.
The SPRL bit is the only bit of Status Register Byte 1 that can be user modified via the Write Status Register Byte 1
command.
Table 11-2. Status Register Format – Byte 2
Bit (1) Name Type (2) Description
7 RES Reserved for future use R 0 Reserved for future use
6 RES Reserved for future use R 0 Reserved for future use
5 RES Reserved for future use R 0 Reserved for future use
4 RSTE Reset Enabled R/W
0 Reset command is disabled (default)
1 Reset command is enabled
3 SLE Sector Lockdown Enabled R/W
0
Sector Lockdown and Freeze Sector Lockdown
State commands are disabled (default)
1
Sector Lockdown and Freeze Sector Lockdown
State commands are enabled
2 PS Program Suspend Status R
0 No sectors are program suspended (default)
1 A sector is program suspended
1 ES Erase Suspend Status R
0 No sectors are erase suspended (default)
1 A sector is erase suspended
0 RDY/BSY Ready/Busy Status R
0 Device is ready
1 Device is busy with an internal operation