SST26WF080BA datasheet(10/96 Pages) MICROCHIP

10 / 96 page

SST26WF040B/040BA SST26WF080B/080BA

DS20005283C-page 10

 2014-2017 Microchip Technology Inc.

4.5

Status Register

The Status register is a read-only register that provides

the following status information: whether the flash

memory array is available for any Read or Write oper-

ation, if the device is write-enabled, whether an erase

or program operation is suspended, and if the Block-

Protection register and/or Security ID are locked down.

During an internal Erase or Program operation, the Sta-

tus register may be read to determine the completion of

an operation in progress. Table 4-2 describes the func-

tion of each bit in the Status register.

4.5.1

WRITE-ENABLE LATCH (WEL)

The Write-Enable Latch (WEL) bit indicates the status

of the internal memory’s Write-Enable Latch. If the

WEL bit is set to ‘1’, the device is write enabled. If the

bit is set to ‘0’ (reset), the device is not write enabled

and does not accept any memory Program or Erase,

Protection Register Write, or Lock-Down commands.

The Write-Enable Latch bit is automatically reset under

the following conditions:

• Power-up

•Reset

• Write-Disable (WRDI) instruction

• Page-Program instruction completion

• Sector-Erase instruction completion

• Block-Erase instruction completion

• Chip-Erase instruction completion

• Write-Block-Protection register instruction

• Lock-Down Block-Protection register instruction

• Program Security ID instruction completion

• Lockout Security ID instruction completion

• Write-Suspend instruction

• SPI Quad Page Program

• Write Status Register

4.5.2

WRITE SUSPEND ERASE STATUS

(WSE)

The Write Suspend-Erase status (WSE) indicates

when an Erase operation has been suspended. The

WSE bit is ‘1’ after the host issues a suspend command

during an Erase operation. Once the suspended Erase

resumes, the WSE bit is reset to ‘0’.

TABLE 4-2:

STATUS REGISTER

Bit

Name

Function

Default at

Power-up

Read/Write (R/

BUSY

Write operation status

1 = Internal Write operation is in progress

0 = No internal Write operation is in progress

WEL

Write-Enable Latch status

1 = Device is write-enabled

0 = Device is not write-enabled

WSE

Write Suspend-Erase status

1 = Erase suspended

0 = Erase is not suspended

WSP

Write Suspend-Program status

1 = Program suspended

0 = Program is not suspended

WPLD

Write Protection Lock-Down status

1 = Write Protection Lock-Down enabled

0 = Write Protection Lock-Down disabled

SEC1

1. The Security ID status will always be ‘1’ at power-up after a successful execution of the Lockout Security ID instruction,

otherwise default at power-up is ‘0’.

Security ID status

1 = Security ID space locked

0 = Security ID space not locked

RES

Reserved for future use

BUSY

Write operation status

1 = Internal Write operation is in progress

0 = No internal Write operation is in progress

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