AT25SL321 datasheet(47/82 Pages) RENESAS

47 / 82 page

DS-AT25SL321-112 Rev. J

Page 47

Nov 1, 2022

AT25SL321 Datasheet

8.24 Release Deep Power Down / Device ID (ABh)

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

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

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

shown in figure Figure 40 and Figure 41. 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 command. To obtain the Device ID in SPI mode, command is initiated

by driving the CS pin low and sending the command 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 42.

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 command is completed by driving CS high.

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

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

Figure 40. Release Power Down Command (SPI Mode)

Figure 41. Release Power Down Command (QPI Mode)

246

Mode 3

Mode 0

Mode 3

Mode 0

Power-Down Current

Stand-By Current

SCK

Command (ABh)

RES1

SCK

Command

(ABh)

Mode 3

Mode 0

Power-Down Current

Stand-ByCurrent

Mode 3

Mode 0

RES1

AT25SL321 Datasheet(PDF) 47 Page - Renesas Technology Corp