Rainbow Electronics AT45DB021D - Manual (Page 20)

20
3638K–DFLASH–11/2012
AT45DB021D
Table 9-1. Status Register Format
10. Deep Power-down
After initial power-up, the device will default in standby mode. The Deep Power-down command allows the device
to enter into the lowest power consumption mode. To enter the Deep Power-down mode, the CS pin must first be
asserted. Once the CS pin has been asserted, an opcode of B9H 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 initiate the Deep Power-
down operation. After the CS pin is de-asserted, the will device enter the Deep Power-down mode within the
maximum t
EDPD
time. Once the device has entered the Deep Power-down mode, all instructions are ignored except
for the Resume from Deep Power-down command.
Table 10-1. Deep Power-down
Figure 10-1. Deep Power-down
10.1 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 t
RDPD
time. The CS pin must remain high during
the t
RDPD
time before the device can receive any commands. After resuming form Deep Power-down, the device
will return to the normal standby mode.
Table 10-2. Resume from Deep Power-down
Figure 10-2. Resume from Deep Power-Down
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
RDY/BUSY COMP 0 1 0 1 PROTECT PAGE SIZE
Command Opcode
Deep Power-down B9H
Opcode
CS
Each transition
represents 8 bits
SI
Command Opcode
Resume from Deep Power-down ABH
Opcode
CS
Each transition
represents 8 bits
SI