AT45DB081D_13 datasheet(23/53 Pages) AD

23 / 53 page

3596O–DFLASH–1/2013

AT45DB081D

12.1 Resume from Deep Power-down

The Resume from Deep Power-down command takes the device out of the Deep Power-down

mode and returns it to the normal standby mode. To Resume from Deep Power-down mode, the

CS pin must first be asserted and an opcode of ABH command must be clocked in via input pin

(SI). After the last bit of the command has been clocked in, the CS pin must be de-asserted to

terminate the Deep Power-down mode. After the CS pin is de-asserted, the device will return to

the normal standby mode within the maximum tRDPD time. The CS pin must remain high during

the tRDPD time before the device can receive any commands. After resuming form Deep Power-

down, the device will return to the normal standby mode.

Table 12-2.

Resume from Deep Power-down

Figure 12-2. Resume from Deep Power-Down

13. “Power of 2” Binary Page Size Option

“Power of 2” binary page size Configuration Register is a user-programmable nonvolatile regis-

ter that allows the page size of the main memory to be configured for binary page size (256-

bytes) or DataFlash standard page size (264-bytes). The “power of 2” page size is a one-time

programmable configuration register and once the device is configured for “power of 2”

page size, it cannot be reconfigured again. The devices are initially shipped with the page

size set to 264-bytes. The user has the option of ordering binary page size (256-bytes) devices

from the factory. For details, please refer to Section 26. ”Ordering Information” on page 47.

For the binary “power of 2” page size to become effective, the following steps must be followed:

1. Program the one-time programmable configuration resister using opcode sequence

3DH, 2AH, 80H and A6H (please see Section 13.1).

2. Power cycle the device (i.e. power down and power up again).

3. User can now program the page for the binary page size.

If the above steps are not followed in setting the the page size prior to page programming, user

may expect incorrect data during a read operation.

The address format will be changed after the device is configured for “power of 2” page size.

See Section 21.7 ”Command Sequence for Read/Write Operations for Page Size 256-Bytes

(Except Status Register Read, Manufacturer and Device ID Read)” on page 38.

Command

Opcode

Resume from Deep Power-down

ABH

Opcode

Each transition

represents 8 bits

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