SST25VF040B-80-4I-SAE-T Microchip Technology, SST25VF040B-80-4I-SAE-T Datasheet - Page 6

• Manufacturer Part Number: SST25VF040B-80-4I-SAE-T
• Description: 2.7V To 3.6V 4Mbit SPI Serial Flash 8 SOIC 3.90mm (.150") T/R
• Manufacturer: Microchip Technology

Specifications of SST25VF040B-80-4I-SAE-T

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 4M (512K x 8)
• Speed: 80MHz
• Interface: SPI Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Data Sheet
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
TABLE 3: 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 memory Write Enable Latch. If the Write-Enable-Latch
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 memory Write (Program/
Erase) commands. The Write-Enable-Latch bit is automati-
cally reset under the following conditions:
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©2009 Silicon Storage Technology, Inc.
Bit
0
1
2
3
4
5
6
7
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
Name
BUSY
WEL
BP0
BP1
BP2
BP3
AAI
BPL
Function
1 = Internal Write operation is in progress
0 = No internal Write operation is in progress
1 = Device is memory Write enabled
0 = Device is not memory Write enabled
Indicate current level of block write protection (See Table 4)
Indicate current level of block write protection (See Table 4)
Indicate current level of block write protection (See Table 4)
Indicate current level of block write protection (See Table 4)
Auto Address Increment Programming status
1 = AAI programming mode
0 = Byte-Program mode
1 = BP3, BP2, BP1, BP0 are read-only bits
0 = BP3, BP2, BP1, BP0 are read/writable
6
Program operation, the status register may be read only to
determine the completion of an operation in progress.
Table 3 describes the function of each bit in the software
status register.
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.
4 Mbit SPI Serial Flash
Default at
Power-up
0
0
1
1
1
0
0
0
SST25VF040B
S71295-05-000
Read/Write
R/W
R/W
R/W
R/W
R/W
R
R
R
T3.0 1295
10/09