SST25WF080 datasheet(7/29 Pages) SST

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Advance Information

8Mbit 1.8V SPI Serial Flash

SST25WF080

S71203-03-000

04/10

Status Register

The software status register provides status on whether the

flash memory array is available for any Read or Write oper-

ation, whether the device is Write enabled, and the state of

the Memory Write protection. During an internal Erase or

Program operation, the status register may be read only to

determine the completion of an operation in progress.

Table 4 describes the function of each bit in the software

status register.

Busy

The Busy bit determines whether there is an internal Erase

or Program operation in progress. A ‘1’ for the Busy bit indi-

cates the device is busy with an operation in progress. A ‘0’

indicates the device is ready for the next valid operation.

Write Enable Latch (WEL)

The Write-Enable-Latch bit indicates the status of the inter-

nal Write-Enable-Latch memory. If the WEL bit is set to ‘1’,

it indicates the device is Write enabled. If the bit is set to ‘0’

(reset), it indicates the device is not Write enabled and

does not accept any Write (Program/Erase) commands.

The Write-Enable-Latch bit is automatically reset under the

following conditions:

•

Device Reset

•

Power-up

•

Write-Disable (WRDI) instruction completion

•

Byte-Program instruction completion

•

Auto Address Increment (AAI) programming is

completed or reached its highest unprotected

memory address

•

Sector-Erase instruction completion

•

Block-Erase instruction completion

•

Chip-Erase instruction completion

•

Write-Status-Register instructions

Auto Address Increment (AAI)

The Auto Address Increment Programming-Status bit pro-

vides status on whether the device is in AAI programming

mode or Byte-Program mode. The default at power up is

Byte-Program mode.

TABLE

4: Software Status Register

Bit

Name

Function

Default at

Power-up

Read/Write

BUSY

1 = Internal Write operation is in progress

0 = No internal Write operation is in progress

WEL

1 = Device is memory Write enabled

0 = Device is not memory Write enabled

BP0

Indicate current level of block write protection (See Table 5)

R/W

BP1

Indicate current level of block write protection (See Table 5)

R/W

BP2

Indicate current level of block write protection (See Table 5)

R/W

BP3

Indicate current level of block write protection (See Table 5)

R/W

AAI

Auto Address Increment Programming status

1 = AAI programming mode

0 = Byte-Program mode

BPL

1 = BP3, BP2, BP1 and BP0 are read-only bits

0 = BP3, BP2, BP1 and BP0 are read/writable

0R/W

T4.1 1203

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