AT45DQ161 Datasheet, PDF (23/81 Pages) List of Unclassifed Manufacturers – 16-Mbit DataFlash (with Extra 512-Kbits), 2.3V or 2.5V Minimum SPI Serial Flash Memory with Dual-I/O and Quad-I/O Support

Figure 7-3. WP Pin and Protection Status
1
WP
2
3
Table 7-3. WP Pin and Protection Status
Time
Period WP Pin
1
High
2
Low
3
High
Enable Sector Protection Command
Command Not Issued Previously
—
Issue Command
X
Command Issued During Period 1 or 2
—
Issue Command
Disable Sector
Protection Command
X
Issue Command
—
X
Not Issued Yet
Issue Command
—
Sector
Protection
Status
Disabled
Disabled
Enabled
Enabled
Enabled
Disabled
Enabled
Sector
Protection
Register
Read/Write
Read/Write
Read/Write
Read
Read/Write
Read/Write
Read/Write
7.3 Sector Protection Register
The nonvolatile Sector Protection Register specifies which sectors are to be protected or unprotected with either the
software or hardware controlled protection methods. The Sector Protection Register contains 16 bytes of data, of which
byte locations 0 through 15 contain values that specify whether Sectors 0 through 15 will be protected or unprotected.
The Sector Protection Register is user modifiable and must be erased before it can be reprogrammed. <blue>Table 7-4
illustrates the format of the Sector Protection Register.
Table 7-4. Sector Protection Register
Sector Number
Protected
Unprotected
0 (0a, 0b)
See <blue>Table 7-5
1 to 15
FFh
00h
Note: 1. The default values for bytes 0 through 15 are 00h when shipped from Adesto.
Table 7-5. Sector 0 (0a, 0b) Sector Protection Register Byte Value
Sectors 0a and 0b Unprotected
Protect Sector 0a
Protect Sector 0b
Protect Sectors 0a and 0b
Bit 7:6
Sector 0a
(Page 0-7)
00
11
00
11
Bit 5:4
Sector 0b
(Page 8-255)
00
00
11
11
Bit 3:2
N/A
XX
XX
XX
XX
Bit 1:0
N/A
XX
XX
XX
XX
Data
Value
0xh
Cxh
3xh
Fxh
Note: 1. x = Don’t care
AT45DQ161 [PRELIMINARY DATASHEET] 23
8790B–DFLASH–10/2013