25F005 Saifun, 25F005 Datasheet - Page 31

• Manufacturer Part Number: 25F005
• Description: Search -----> SF25F005
• Manufacturer: Saifun

Release from Software Protect
(RES)
Once the device has entered SP mode, all
instructions are ignored except the RES
mode.
Any RES instruction executed while an
Erase, Program or Write Status Register
cycle is in progress is not decoded, and
has no effect on the cycle that is in
progress.
The device is first selected by driving CSb
low, followed by an 8-bit instruction byte,
with each bit being latched in on SI during
the rising edge of SCK.
SCK
CS
SI
Figure 25. Release from Software Protect (RES) Instruction Sequence
0
Software Protect Mode
1
2
Instruction
3
4
5
Driving CSb high after the 8-bit instruction
byte has been received by the device, but
before the whole of the 8-bit Electronic
Signature has been transmitted for the first
time (as shown in Figure 25), will still
ensure that the device is put into Standby
mode. The transition to Standby mode is
delayed by t
for at least t
Table 4 on page 10. Once in Standby
mode, the device waits to be selected, so
that it can receive, decode and execute
instructions.
6
7
RES
t
RES
, and CSb must remain high
RES
SA25F005 Advanced Information
(max), as specified in
Standby Mode
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31