AT45DB081D-MU-2.5 Atmel, AT45DB081D-MU-2.5 Datasheet - Page 15
![IC FLASH 8MBIT 50MHZ 8VDFN](/photos/7/26/72647/8-vfqfn-8m1-a_sml.jpg)
AT45DB081D-MU-2.5
Manufacturer Part Number
AT45DB081D-MU-2.5
Description
IC FLASH 8MBIT 50MHZ 8VDFN
Manufacturer
Atmel
Datasheet
1.AT45DB081D-MU.pdf
(53 pages)
Specifications of AT45DB081D-MU-2.5
Format - Memory
FLASH
Memory Type
DataFLASH
Memory Size
8M (4096 pages x 264 bytes)
Speed
50MHz
Interface
SPI, RapidS
Voltage - Supply
2.5 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Package / Case
8-VFQFN, 8-VFQFPN
Architecture
Sectored
Interface Type
SPI
Supply Voltage (max)
3.6 V
Supply Voltage (min)
2.5 V
Maximum Operating Current
15 mA
Mounting Style
SMD/SMT
Organization
64 KB x 16
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
9.1.2
3596M–DFLASH–5/10
Program Sector Protection Register Command
Table 9-4.
Figure 9-2.
Once the Sector Protection Register has been erased, it can be reprogrammed using the Pro-
gram Sector Protection Register command.
To program the Sector Protection Register, the CS pin must first be asserted and the appropri-
ate 4-byte opcode sequence must be clocked into the device via the SI pin. The 4-byte opcode
sequence must start with 3DH and be followed by 2AH, 7FH, and FCH. After the last bit of the
opcode sequence has been clocked into the device, the data for the contents of the Sector
Protection Register must be clocked in. As described in
ister contains 16-bytes of data, so 16-bytes must be clocked into the device. The first byte of
data corresponds to sector zero, the second byte corresponds to sector one, and so on with the
last byte of data corresponding to sector 15.
After the last data byte has been clocked in, the CS pin must be deasserted to initiate the inter-
nally self-timed program cycle. The programming of the Sector Protection Register should take
place in a time of t
the device is powered-down during the program cycle, then the contents of the Sector Protection
Register cannot be guaranteed.
If the proper number of data bytes is not clocked in before the CS pin is deasserted, then the
protection status of the sectors corresponding to the bytes not clocked in can not be guaranteed.
For example, if only the first two bytes are clocked in instead of the complete 16-bytes, then the
protection status of the last 14 sectors cannot be guaranteed. Furthermore, if more than 16-
bytes of data is clocked into the device, then the data will wrap back around to the beginning of
the register. For instance, if 17-bytes of data are clocked in, then the 17
byte location zero of the Sector Protection Register.
If a value other than 00H or FFH is clocked into a byte location of the Sector Protection Register,
then the protection status of the sector corresponding to that byte location cannot be guaran-
teed. For example, if a value of 17H is clocked into byte location two of the Sector Protection
Register, then the protection status of sector two cannot be guaranteed.
The Sector Protection Register can be reprogrammed while the sector protection enabled or dis-
abled. Being able to reprogram the Sector Protection Register with the sector protection enabled
allows the user to temporarily disable the sector protection to an individual sector rather than dis-
abling sector protection completely.
The Program Sector Protection Register command utilizes the internal SRAM buffer 1 for pro-
cessing. Therefore, the contents of the buffer 1 will be altered from its previous state when this
command is issued.
Command
Erase Sector Protection Register
Erase Sector Protection Register Command
Erase Sector Protection Register
CS
SI
P
, during which time the Status Register will indicate that the device is busy. If
Each transition
represents 8 bits
Opcode
Byte 1
Byte 1
Opcode
Byte 2
3DH
Opcode
Byte 3
Byte 2
Section
2AH
Atmel AT45DB081D
Opcode
Byte 4
9.1, the Sector Protection Reg-
Byte 3
7FH
th
byte will be stored at
Byte 4
CFH
15