M25P40 Serial Flash Embedded Memory
WRITE ENABLE
WRITE ENABLE
The WRITE ENABLE command sets the write enable latch (WEL) bit.
The WEL bit must be set before execution of every PROGRAM, ERASE, and WRITE com-
mand.
The WRITE ENABLE command is entered by driving chip select (S#) LOW, sending the
command code, and then driving S# HIGH.
Figure 7: WRITE ENABLE Command Sequence
0
1
2
3
4
5
6
7
C
S#
Command bits
LSB
DQ[0]
DQ1
0
0
0
0
0
1
1
0
MSB
High-Z
Don’t Care
PDF: 09005aef8456654f
m25p40.pdf - Rev. G 05/13 EN
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