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R1EX25032Axx00A/R1EX25064Axx00A
Write Disable (WRDI):
One way of resetting the Write Enable Latch (WEL) bit is to send a Write Disable instruction to the device. As shown
in the following figure, to send this instruction to the device, chip select ( S ) is driven low, and the bits of the instruction
byte are shifted in, on serial data input (D).
The device then enters a wait state. It waits for the device to be deselected, by chip select ( S ) being driven high. The
Write Enable Latch (WEL) bit, in fact, becomes reset by any of the following events:
?
?
?
?
Power-up
WRDI instruction execution
WRSR instruction completion
WRITE instruction completion
Write Disable (WRDI) Sequence
S
W
V IH
V IL
V IH
V IL
0
1
2
3
4
5
6
7
C
V IH
V IL
V IH
Instruction
D
Q
V IL
High-Z
REJ03C0358-0002.Rev.0.02 Jan.14.2009
page 11 of 20
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