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W25Q16JVSSIQ Datasheet(PDF) 54 Page - Winbond

Part # W25Q16JVSSIQ
Description  3V 16M-BIT SERIAL FLASH MEMORY WITH DUAL/QUAD SPI
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W25Q16JVSSIQ Datasheet(HTML) 54 Page - Winbond

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W25Q16JV
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Individual Block/Sector Unlock (39h)
The Individual Block/Sector Lock provides an alternative way to protect the memory array from adverse
Erase/Program. In order to use the Individual Block/Sector Locks, the WPS bit in Status Register-3 must
be set to 1. If WPS=0, the write protection will be determined by the combination of CMP, SEC, TB, BP[2:0]
bits in the Status Registers. The Individual Block/Sector Lock bits are volatile bits. The default values after
device power up or after a Reset are 1, so the entire memory array is being protected.
To unlock a specific block or sector as illustrated in Figure 4d, an Individual Block/Sector Unlock command
must be issued by driving /CS low, shifting the instruction code “39h” into the Data Input (DI) pin on the
rising edge of CLK, followed by a 24-bit address and then driving /CS high. A Write Enable instruction must
be executed before the device will accept the Individual Block/Sector Unlock Instruction (Status Register
bit WEL= 1).
Figure 54. Individual Block Unlock Instruction
/CS
CLK
DI
(IO0)
DO
(IO1)
Mode 0
Mode 3
0
1
2
3
4
5
6
7
Instruction (39h)
High Impedance
8
9
29
30
31
24-Bit Address
23
22
2
1
0
*
Mode 0
Mode 3
= MSB
*


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