AT45DB021D-SU Atmel, AT45DB021D-SU Datasheet - Page 12

• Manufacturer Part Number: AT45DB021D-SU
• Description: Flash 2M SERIAL 2.7V - IND TEMP
• Manufacturer: Atmel

Specifications of AT45DB021D-SU

• Product Category: Flash
• Rohs: yes
• Memory Size: 2 Mbit
• Architecture: Sectored
• Interface Type: SPI
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V
• Maximum Operating Current: 15 mA
• Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC
• Organization: 32 KB x 8
• Factory Pack Quantity: 95

7.1
12
The table below details the sector protection status for various scenarios of the WP pin, the Enable Sector
Protection command, and the Disable Sector Protection command.
Figure 7-1.
Table 7-1.
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 8-bytes of data,
of which byte locations zero through seven contain values that specify whether sectors zero through seven will be
protected or unprotected. The Sector Protection Register is user modifiable and must first be erased before it can
be reprogrammed.
Table 7-2.
Table 7-3.
Note:
Sector Number
Protected
Unprotected
Sectors 0a, 0b Unprotected
Protect Sector 0a
Protect Sector 0b (Page 8-127)
Protect Sectors 0a (Page 0-7), 0b (Page 8-127)
WP
Atmel AT45DB021D
Period
Time
1
2
3
1. The default value for bytes 0 through 7 when shipped from Atmel is 00H
x = don’t care
WP Pin
High
High
Low
WP Pin and Protection Status
WP Pin and Protection Status
Sector Protection Register.
Sector 0 (0a, 0b)
Table 7-3
1
Command Issued During Period 1
Command Not Issued Previously
Enable Sector Protection
illustrates the format of the Sector Protection Register
Issue Command
Issue Command
Command
or 2
X
–
–
(1)
See
0 (0a, 0b)
Table 7-3
Protection Command
(Page 0-7)
2
Bit 7, 6
Issue Command
Issue Command
Disable Sector
0a
00
11
00
11
Not Issued Yet
X
X
–
–
(Page 8-127)
Bit 5, 4
0b
00
00
11
11
1 to 7
FFH
Protection Status
00H
Disabled
Disabled
Disabled
Enabled
Enabled
Enabled
Enabled
Sector
Bit 3, 2
xx
xx
xx
xx
3
Bit 1, 0
xx
xx
xx
xx
3638J–DFLASH–5/10
Protection
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read Only
Register
Sector
Value
Data
CxH
0xH
3xH
FxH