AT45DB321D-CCU Adesto Technologies, AT45DB321D-CCU Datasheet - Page 12

• Manufacturer Part Number: AT45DB321D-CCU
• Description: Flash 32M 2.7-3.6V, 66Mhz Serial Flash
• Manufacturer: Adesto Technologies

Specifications of AT45DB321D-CCU

• Rohs: yes
• Data Bus Width: 8 bit
• Memory Type: Data Flash
• Memory Size: 32 Mbit
• Architecture: Flexible, Uniform Erase
• Timing Type: Synchronous
• Interface Type: SPI
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V
• Maximum Operating Current: 15 mA
• Operating Temperature: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: BGA-24
• Factory Pack Quantity: 378

7.1
7.1.1
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 method. The sector protection register contains 64 bytes of data, in which byte locations 0
through 63 contain values that specify whether sectors 0 through 63 will be protected or unprotected. The sector protection
register is user modifiable, and must first be erased before it can be reprogrammed.
protection register.
Table 7-2.
Table 7-3.
Note:
Erase Sector Protection Register Command
In order to modify and change the value of the sector protection register, it must first be erased using the erase sector protection
register command.
To erase the sector protection register, the CS pin must first be asserted, as it would be with any other command. Once the CS
pin has been asserted, the appropriate four-byte opcode sequence must be clocked into the device via the SI pin. The four-byte
opcode sequence must start with 3DH, and be followed by 2AH, 7FH, and CFH. After the last bit of the opcode sequence has
been clocked in, the CS pin must be deasserted to initiate the internally self-timed erase cycle. The erasing of the sector
protection register should take place in a maximum time of t
is busy. If the device is powered down before the completion of the erase cycle, then the contents of the sector protection
register cannot be guaranteed.
Sector Number
Protected
Unprotected
Sectors 0a, 0b unprotected
Protect sector 0a (pages 0-7)
Protect sector 0b (pages 8-127)
Protect sectors 0a (pages 0-7), 0b (pages 8-127)
Period
Time
1
2
3
1.
WP Pin and Protection Status
Sector Protection Register
Sector 0 (0a, 0b)
The default value for bytes 0 through 63 when shipped from Adesto
x = don’t care.
WP Pin
High
High
Low
Command issued during period 1 or 2
Command not issued previously
Enable Sector Protection
Issue command
Issue command
Command
X
–
–
(1)
(Pages 0-7)
PE
Bit 7, 6
, during which time the status register will indicate that the device
0a
00
11
00
11
See
Protection Command
0 (0a, 0b)
Issue command
issue command
Disable Sector
Not issued yet
Table 7-3
(Pages 8-127)
X
X
–
–
Bit 5, 4
0b
00
00
11
11
®
is 00H.
Table 7-3
AT45DB321D [DATASHEET]
Bit 3, 2
xx
xx
xx
xx
Protection
illustrates the format of the sector
Disabled
Disabled
Disabled
Enabled
Enabled
Enabled
Enabled
Sector
Status
3597R–DFLASH–11/2012
Bit 1, 0
1 to 63
FFH
00H
xx
xx
xx
xx
Protection
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read only
Register
Sector
Value
Data
CxH
0xH
3xH
FxH
12