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M25P20 Fiches technique(PDF) 22 Page - STMicroelectronics

No de pièce M25P20
Description  2 Mbit, Low Voltage, Serial Flash Memory With 40MHz SPI Bus Interface
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M25P20 Fiches technique(HTML) 22 Page - STMicroelectronics

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Instructions
M25P20
22/50
6.5
Write Status Register (WRSR)
The Write Status Register (WRSR) instruction allows new values to be written to the Status
Register. Before it can be accepted, a Write Enable (WREN) instruction must previously
have been executed. After the Write Enable (WREN) instruction has been decoded and
executed, the device sets the Write Enable Latch (WEL).
The Write Status Register (WRSR) instruction is entered by driving Chip Select (S) Low,
followed by the instruction code and the data byte on Serial Data Input (D).
The instruction sequence is shown in Figure 11.
The Write Status Register (WRSR) instruction has no effect on b6, b5, b4, b1 and b0 of the
Status Register. b6, b5 and b4 are always read as 0.
Chip Select (S) must be driven High after the eighth bit of the data byte has been latched in.
If not, the Write Status Register (WRSR) instruction is not executed. As soon as Chip Select
(S) is driven High, the self-timed Write Status Register cycle (whose duration is tW) is
initiated. While the Write Status Register cycle is in progress, the Status Register may still
be read to check the value of the Write In Progress (WIP) bit. The Write In Progress (WIP)
bit is 1 during the self-timed Write Status Register cycle, and is 0 when it is completed. At
some unspecified time before the cycle is completed, the Write Enable Latch (WEL) is reset.
The Write Status Register (WRSR) instruction allows the user to change the values of the
Block Protect (BP1, BP0) bits, to define the size of the area that is to be treated as read-
only, as defined in Table 2. The Write Status Register (WRSR) instruction also allows the
user to set or reset the Status Register Write Disable (SRWD) bit in accordance with the
Write Protect (W) signal. The Status Register Write Disable (SRWD) bit and Write Protect
(W) signal allow the device to be put in the Hardware Protected Mode (HPM). The Write
Status Register (WRSR) instruction is not executed once the Hardware Protected Mode
(HPM) is entered.
Figure 11.
Write Status Register (WRSR) Instruction Sequence
C
D
AI02282D
S
Q
2
1
3456789 10 11 12 13 14 15
High Impedance
Instruction
Status
Register In
0
765432
0
1
MSB


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