AT25QL641 datasheet(19/77 Pages) DIALOG

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AT25QL641

DS-25QL641–130E–10/2018

7.2

Write Enable (06h)

Write Enable instruction is for setting the Write Enable Latch (WEL) bit in the Status Register. The WEL bit must be set prior to

every Program, Erase and Write Status Register instruction. To enter the Write Enable instruction, CS goes low prior to the

instruction “06h” into Data Input (SI) pin on the rising edge of SCK, and then driving CS high.

Figure 7-1.

Write Enable Instruction for SPI Mode (left) and QPI Mode (right)

7.3

Write Enable for Volatile Status Register (50h)

This gives more flexibility to change the system configuration and memory protection schemes quickly without waiting

for the typical non-volatile bit write cycles or affecting the endurance of the Status Register non-volatile bits. To write the

volatile values into the Status Register bits, the Write Enable for Volatile Status Register (50h) instruction must be issued

prior to a Write Status Register (01h) instruction. Write Enable for Volatile Status Register instruction (Figure 7-2) does

not set the Write Enable Latch (WEL) bit. Once Write Enable for Volatile Status Register is set, a Write Enable

instruction should not have been issued prior to setting Write Status Register instruction (01h or 31h). When Write

Burst Read with

Wrap

up to 80

MHz

0Ch

A23:A16

A15:A8

A7:A0

Dummy

(D7:D0)

up to 104

MHz

A23:A16

A15:A8

A7:A0

Dummy

Dummy (D7:D0)

up to 133

MHz

A23:A16

A15:A8

A7:A0

Dummy

Dummy Dummy (D7:D0)

Set Read Parameter

C0h

P7:P0

Quad Page Program

33h

A23:A16

A15:A8

A7:A0

(D7:D0)

Data bytes are shifted with Most Significant Bit first. Byte fields with data in parenthesis “()” indicate data being read from the device on the I/O pin.

SR = Status Register. The Status Register contents and Device ID will repeat continuously until CS terminates the instruction.

At least one byte of data input is required for Page Program, Quad Page Program and Program Security Register, up to 256 bytes of data input. If more

than 256 bytes of data are sent to the device, the addressing will wrap to the beginning of the page and overwrite previously sent data.

See Manufacturer and Device Identification table for Device ID information.

SC = Security Register.

Table 7-5.

Instruction Set Table 4 (QPI Instructions) (Continued)

Instruction Byte (1)

Clock Number

0, 1

2, 3

4, 5

6, 7

8, 9

10, 11

12, 13

14, 15

16, 17

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