AT25DF041A-SH-B Atmel, AT25DF041A-SH-B Datasheet - Page 18

• Manufacturer Part Number: AT25DF041A-SH-B
• Description: Flash 4 Megabit 2.7V
• Manufacturer: Atmel

Specifications of AT25DF041A-SH-B

• Architecture: Sectored
• Interface Type: SPI Serial
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Current: 12 mA
• Mounting Style: SMD/SMT
• Organization: 8 KB x 2
• Memory Size: 4 Mbit
• Operating Temperature: + 85 C
• Package / Case: SOIC
• Memory Type: Flash
• Memory Configuration: 2048 Pages X 256 Bytes
• Clock Frequency: 70MHz
• Supply Voltage Range: 2.7V To 3.6V
• Memory Case Style: SOIC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.5
Global Protect/Unprotect
The Global Protect and Global Unprotect features can work in conjunction with the Protect Sec-
tor and Unprotect Sector functions. For example, a system can globally protect the entire
memory array and then use the Unprotect Sector command to individually unprotect certain sec-
tors and individually reprotect them later by using the Protect Sector command. Likewise, a
system can globally unprotect the entire memory array and then individually protect certain sec-
tors as needed.
Performing a Global Protect or Global Unprotect is accomplished by writing a certain combina-
tion of data to the Status Register using the Write Status Register command (see “Write Status
Register” section on
page 26
for command execution details). The Write Status Register com-
mand is also used to modify the SPRL (Sector Protection Registers Locked) bit to control
hardware and software locking.
To perform a Global Protect, the appropriate WP pin and SPRL conditions must be met, and the
system must write a logical “1” to bits 5, 4, 3, and 2 of the Status Register. Conversely, to per-
form a Global Unprotect, the same WP and SPRL conditions must be met but the system must
write a logical “0” to bits 5, 4, 3, and 2 of the Status Register.
Table 9-2
details the conditions
necessary for a Global Protect or Global Unprotect to be performed.
AT25DF041A
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