AT45DB021D-SSH-B Atmel, AT45DB021D-SSH-B Datasheet - Page 16
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AT45DB021D-SSH-B
Manufacturer Part Number
AT45DB021D-SSH-B
Description
IC FLASH 2MBIT 66MHZ 8SOIC
Manufacturer
Atmel
Specifications of AT45DB021D-SSH-B
Format - Memory
FLASH
Memory Type
DataFLASH
Memory Size
2M (1024 pages x 264 bytes)
Speed
66MHz
Interface
SPI, RapidS
Voltage - Supply
2.7 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (3.9mm Width)
Architecture
Sectored
Interface Type
SPI
Supply Voltage (max)
3.6 V
Supply Voltage (min)
2.7 V
Maximum Operating Current
15 mA
Mounting Style
SMD/SMT
Organization
32 KB x 8
Memory Configuration
1024 Pages X 264 Bytes
Clock Frequency
66MHz
Supply Voltage Range
2.7V To 3.6V
Memory Case Style
SOIC
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
AT45DB021D-SSH
AT45DB021D-SSH
AT45DB021D-SSU
AT45DB021D-SSU
AT45DB021D-SSH
AT45DB021D-SSU
AT45DB021D-SSU
8.1.1
8.1.2
16
Sector Lockdown Register
Sector Lockdown Register is a nonvolatile register that contains 8-bytes of data, as shown below:
Table 8-2.
Table 8-3.
Reading the Sector Lockdown Register
The Sector Lockdown Register can be read to determine which sectors in the memory array are permanently
locked down. To read the Sector Lockdown Register, the CS pin must first be asserted. Once the CS pin has been
asserted, an opcode of 35H and 3 dummy bytes must be clocked into the device via the SI pin. After the last bit of
the opcode and dummy bytes have been clocked in, the data for the contents of the Sector Lockdown Register will
be clocked out on the SO pin. The first byte corresponds to sector 0 (0a, 0b) the second byte corresponds to sector
one and the last byte (byte eight) corresponds to sector seven. After the last byte of the Sector Lockdown Register
has been read, additional pulses on the SCK pin will simply result in undefined data being output on the SO pin.
Deasserting the CS pin will terminate the Read Sector Lockdown Register operation and put the SO pin into a
high-impedance state.
Table 8-4
Table 8-4.
Figure 8-2.
Sector Number
Locked
Unlocked
Sectors 0a, 0b Unlocked
Sector 0a Locked (Page 0-7)
Sector 0b Locked (Page 8-127)
Sectors 0a, 0b Locked (Page 0-127)
Command
Read Sector Lockdown Register
Note:
CS
SO
Atmel AT45DB021D
SI
Each transition
represents 8 bits
xx = Dummy Byte
details the values read from the Sector Lockdown Register.
Sector Lockdown Register
Sector 0 (0a, 0b)
Sector Lockdown Register
Read Sector Lockdown Register
Opcode
X
X
Byte 1
35H
See Below
0 (0a, 0b)
X
(Page 0-7)
Bit 7, 6
Byte 2
Data Byte
0a
00
11
00
11
xxH
n
(Page 8-127)
Data Byte
Bit 5, 4
Byte 3
n + 1
0b
00
00
11
11
xxH
1 to 7
FFH
00H
Bit 3, 2
Byte 4
00
00
00
00
xxH
Data Byte
n + 3
Bit 1, 0
00
00
00
00
3638J–DFLASH–5/10
Value
Data
C0H
00H
30H
F0H