39

3686I–DFLASH–02/2019

AT25DF321A

Figure 12-3.Deep Power-Down

12.4

Resume from Deep Power-Down

In order to exit the Deep Power-Down mode and resume normal device operation, the Resume from Deep Power-Down

command must be issued. The Resume from Deep Power-Down command is the only command that the device will

recognized while in the Deep Power-Down mode.

To resume from the Deep Power-Down mode, the CS pin must first be asserted and opcode of ABh must be clocked into the

device. Any additional data clocked into the device after the opcode will be ignored. When the CS pin is deasserted, the device

will exit the Deep Power-Down mode within the maximum time of t

RDPD and return to the standby mode. After the device has

returned to the standby mode, normal command operations such as Read Array can be resumed.

If the complete opcode is not clocked in before the CS pin is deasserted, or if the CS pin is not deasserted on an even byte

boundary (multiples of eight bits), then the device will abort the operation and return to the Deep Power-Down mode.

Figure 12-4.Resume from Deep Power-Down

SCK

CS

SI

SO

MSB

ICC

2

3

1

0

1

0

1

1

1

0

0

1

6

7

5

4

OPCODE

HIGH-IMPEDANCE

Standby Mode Current

Active Current

Deep Power-Down Mode Current

tEDPD

SCK

CS

SI

SO

MSB

ICC

2

3

1

0

1

0

1

0

1

0

1

1

6

7

5

4

OPCODE

HIGH-IMPEDANCE

Deep Power-Down Mode Current

Active Current

Standby Mode Current

tRDPD