AT45DB011D-MH-T Atmel, AT45DB011D-MH-T Datasheet - Page 19

• Manufacturer Part Number: AT45DB011D-MH-T
• Description: IC FLASH 1MBIT 66MHZ 8UDFN
• Manufacturer: Atmel

Specifications of AT45DB011D-MH-T

• Format - Memory: FLASH
• Memory Type: DataFLASH
• Memory Size: 1M (512 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-UDFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.1.1
10.1.2
Figure 10-2. Read Sector Lockdown Register
3639H–DFLASH–04/09
CS
SO
Sector Lockdown Register
Reading the Sector Lockdown Register
SI
Each transition
represents 8 bits
Opcode
Sector Lockdown Register is a nonvolatile register that contains 4 bytes of data, as shown
below:
Table 10-1.
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 1 and the last byte (byte 4) corresponds to sector 3. After the last byte of the Sector Lock-
down 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 10-2
Table 10-2.
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:
xx = Dummy Byte
details the values read from the Sector Lockdown Register.
X
Sector 0 (0a, 0b)
Sector Lockdown Register
X
X
(Page 0-7)
Bit 7, 6
Data Byte
0a
00
00
11
11
n
Byte 1
35H
See Below
0 (0a, 0b)
(Page 8-127)
Data Byte
Bit 5, 4
n + 1
0b
00
00
11
11
Byte 2
xxH
Bit 3, 2
00
00
00
00
Data Byte
Byte 3
n + 3
xxH
Bit 1, 0
00
00
00
00
1 to 3
FFH
00H
Byte 4
xxH
Value
Data
C0H
00H
30H
F0H
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