AT25DF161-MH-Y Atmel, AT25DF161-MH-Y Datasheet - Page 18

• Manufacturer Part Number: AT25DF161-MH-Y
• Description: IC FLASH 16MBIT 100MHZ 8UDFN
• Manufacturer: Atmel

Specifications of AT25DF161-MH-Y

• Format - Memory: FLASH
• Memory Type: DataFLASH
• Memory Size: 16M (2M x 8)
• Speed: 100MHz
• 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

9.
9.1
18
Figure 8-8.
Protection Commands and Features
Write Enable
The Write Enable command is used to set the Write Enable Latch (WEL) bit in the Status Register to a logical “1” state.
The WEL bit must be set before a Byte/Page Program, erase, Protect Sector, Unprotect Sector, Sector Lockdown, Freeze
Sector Lockdown State, Program OTP Security Register, or Write Status Register command can be executed. This makes
the issuance of these commands a two step process, thereby reducing the chances of a command being accidentally or
erroneously executed. If the WEL bit in the Status Register is not set prior to the issuance of one of these commands, then
the command will not be executed.
To issue the Write Enable command, the CS pin must first be asserted and the opcode of 06h must be clocked into the
device. No address bytes need to be clocked into the device, and any data clocked in after the opcode will be ignored.
When the CS pin is deasserted, the WEL bit in the Status Register will be set to a logical “1”. The complete opcode must
be clocked into the device before the CS pin is deasserted, and the CS pin must be deasserted on an even byte boundary
(multiples of eight bits); otherwise, the device will abort the operation and the state of the WEL bit will not change.
Figure 9-1.
Atmel AT25DF161
SCK
SCK
SO
CS
SO
CS
SI
SI
Program/Erase Resume
Write Enable
3687E–DFLASH–11/10