W25Q64FVSFIG【PDF 47/89 页】IC SPI FLASH 64MBIT 16SOIC

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W25Q64FV

6.2.22

Sector Erase (20h)

The Sector Erase instruction sets all memory within a specified sector (4K-bytes) to the erased state of all

1s (FFh). A Write Enable instruction must be executed before the device will accept the Sector Erase

Instruction (Status Register bit WEL must equal 1). The instruction is initiated by driving the /CS pin low

and shifting the instruction code “20h” followed a 24 -bit sector address (A23-A0) (see Figure 2). The

Sector Erase instruction sequence is shown in Figure 21a & 21b.

The /CS pin must be driven high after the eighth bit of the last byte has been latched. If this is not done

the Sector Erase instruction will not be executed. After /CS is driven high, the self-timed Sector Erase

instruction will commence for a time duration of t SE (See AC Characteristics). While the Sector Erase

cycle is in progress, the Read Status Register instruction may still be accessed for checking the status of

the BUSY bit. The BUSY bit is a 1 during the Sector Erase cycle and becomes a 0 when the cycle is

finished and the device is ready to accept other instructions again. After the Sector Erase cycle has

finished the Write Enable Latch (WEL) bit in the Status Register is cleared to 0. The Sector Erase

instruction will not be executed if the addressed page is protected by the Block Protect (CMP, SEC, TB,

BP2, BP1, and BP0) bits (see Status Register Memory Protection table).

/CS

Mode 3

0

1

2

3

4

5

6

7

8

9

29

30

31

Mode 3

CLK

Mode 0

Instruction (20h)

24-Bit Address

Mode 0

DI

(IO 0 )

23

*

22

2

1

0

DO

(IO 1 )

* = MSB

/CS

High Impedance

Figure 21a. Sector Erase Instruction (SPI Mode)

Mode 3

0

1

2

3

4

5

6

7

Mode 3

CLK

Mode 0

Mode 0

In structio n

20h

A23-16

A15-8

A7-0

IO 0

IO 1

IO 2

IO 3

20

21

22

23

16

17

18

19

12

13

14

15

8

9

10

11

4

5

6

7

0

1

2

3

Figure 21b. Sector Erase Instruction (QPI Mode)

- 47 -

Publication Release Date:

October 07, 2013

Revision L

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