4 resume from deep power-down – Rainbow Electronics AT25DQ321 User Manual
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AT25DQ321 [DATASHEET]
8718D–DFLASH–12/2012
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 a 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
SO
SI
SCK
CS
I
CC
MSB
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
t
RDPD