25F005 Saifun, 25F005 Datasheet - Page 20

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

Write Enable (WREN)
The device powers up in the Write Disable
state when V
instructions must be preceded by a WREN
instruction. The instruction sequence is
shown in Figure 11, with SO in high
impedance.
SCK
SCK
CC
CS
CS
SI
SI
is applied. All programming
Figure 11. Write Enable (WREN) Instruction Sequence
Figure 12. Write Disable (WRDI) Instruction Sequence
0
0
1
1
2
2
Instruction
Instruction
3
3
Write Disable (WRDI)
To protect the device against inadvertent
writes, the WRDI instruction disables all
programming
instruction is independent of the WP pin's
status. The WREN instruction should be
executed after the WRDI instruction to
re-enable all programming modes. The
instruction sequence is shown in Figure 12,
with SO in high impedance.
4
4
5
5
6
6
7
7
modes.
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WRDI
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