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AT25SL321

DS-25SL321–112H–2020-10

8.24 Release Deep Power Down / Device ID (ABh)

The Release Deep Power Down / Device ID instruction is a multi-purpose instruction. It can be used to release

the device from the Deep Power Down state or obtain the device identification (ID).

The instruction is issued by driving the CS pin low, sending the instruction code ABh and driving CS high as

shown in figure Figure 8-39 and Figure 8-40. The Release from Deep Power Down operation requires the time

duration of tRES1. The CS pin must keep high during the tRES1 time duration.

The Device ID can be read during SPI mode only. In other words, Device ID feature is not available in QPI mode

for Release Deep Power Down/Device ID instruction. To obtain the Device ID in SPI mode, instruction is initiated

by driving the CS pin low and sending the instruction code ABh with following 3-dummy bytes. The Device ID

bits are then shifted on the falling edge of SCK with most significant bit (MSB) first, as shown in Figure 8-41.

After CS is driven high it must keep high for a time duration of tRES2. See Section 9.8, AC Electrical

Characteristics. The Device ID can be read continuously. The instruction is completed by driving CS high.

If the Release from Deep Power Down /Device ID instruction is issued while an Erase, Program or Write cycle is in

process (when BUSY equals 1) the instruction is ignored and does not have any effects on the current cycle.

Figure 8-39. Release Power Down Instruction (SPI Mode)

Figure 8-40. Release Power Down Instruction (QPI Mode)

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