AT25DF641-S3H-T Atmel, AT25DF641-S3H-T Datasheet - Page 37

• Manufacturer Part Number: AT25DF641-S3H-T
• Description: IC FLASH 64MBIT 100MHZ 16SOIC
• Manufacturer: Atmel

Specifications of AT25DF641-S3H-T

• Format - Memory: FLASH
• Memory Type: DataFLASH
• Memory Size: 64M (32K pages x 256 bytes)
• Speed: 100MHz
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.1.6. RSTE Bit
10.1.7. SLE Bit
10.1.8. PS Bit
10.1.9. ES Bit
10.1.10. RDY/BSY Bit
3680F–DFLASH–4/10
The RSTE bit is used to enable or disable the Reset command. When the RSTE bit is in the logical “0” state (the
default state after power-up), the Reset command is disabled and any attempts to reset the device using the
Reset command will be ignored. When the RSTE bit is in the logical “1” state, the Reset command is enabled.
The RSTE bit will retain its state as long as power is applied to the device. Once set to the logical “1” state, the
RSTE bit will remain in that state until it is modified using the Write Status Register Byte 2 command or until the
device has been power cycled. The Reset command itself will not change the state of the RSTE bit.
The SLE bit is used to enable and disable the Sector Lockdown and Freeze Sector Lockdown State commands.
When the SLE bit is in the logical “0” state (the default state after power-up), the Sector Lockdown and Freeze
Sector Lockdown commands are disabled. If the Sector Lockdown and Freeze Sector Lockdown commands are
disabled, then any attempts to issue the commands will be ignored. This provides a safeguard for these
commands against accidental or erroneous execution. When the SLE bit is in the logical “1” state, the Sector
Lockdown and Freeze Sector Lockdown State commands are enabled.
Unlike the WEL bit, the SLE bit does not automatically reset after certain device operations. Therefore, once set,
the SLE bit will remain in the logical “1” state until it is modified using the Write Status Register Byte 2 command
or until the device has been power cycled. The Reset command has no effect on the SLE bit.
If the Freeze Sector Lockdown State command has been issued, then the SLE bit will be permanently reset in the
logical “0” state to indicate that the Sector Lockdown command has been disabled.
The PS bit indicates whether or not a sector is in the Program Suspend state.
The ES bit indicates whether or not a sector is in the Erase Suspend state.
The RDY/BSY bit is used to determine whether or not an internal operation, such as a program or erase, is in
progress. To poll the RDY/BSY bit to detect the completion of a program or erase cycle, new Status Register data
must be continually clocked out of the device until the state of the RDY/BSY bit changes from a logical “1” to a
logical “0”.
Figure 10-1. Read Status Register
SCK
SO
CS
SI
HIG H-IMP E DANC E
MS B
0
0
0
1
0
2
OPCODE
0
3
0
4
1
5
0
6
1
7
MS B
D
8
D
S TATUS R E GIS TE R
9
D
10 11
BYTE 1
D
D
12
D
13 14
D
D
15 16
MS B
D
S TATUS R E GIS TE R
D
17
D
18
BYTE 2
D
19
D
20
D
21 22
D
Atmel AT25DF641
D
23 24
MS B
D
S TATUS R E GIS TE R
D
25
D
26
BYTE 1
D
27
D
28 29
D
D
30
D
37