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M25PE20 Datasheet(PDF) 13 Page - STMicroelectronics

Part # M25PE20
Description  1 and 2 Mbit, Low Voltage, Page-Erasable Serial Flash Memories with Byte-Alterability, 33 MHz SPI Bus, Standard Pin-out
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M25PE20 Datasheet(HTML) 13 Page - STMicroelectronics

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M25PE10, M25PE20
Write Enable (WREN)
The Write Enable (WREN) instruction (Figure 8.)
sets the Write Enable Latch (WEL) bit.
The Write Enable Latch (WEL) bit must be set pri-
or to every Page Write (PW), Page Program (PP),
Page Erase (PE), and Sector Erase (SE) instruc-
tion.
The Write Enable (WREN) instruction is entered
by driving Chip Select (S) Low, sending the in-
struction code, and then driving Chip Select (S)
High.
Figure 8. Write Enable (WREN) Instruction Sequence
Write Disable (WRDI)
The Write Disable (WRDI) instruction (Figure 9.)
resets the Write Enable Latch (WEL) bit.
The Write Disable (WRDI) instruction is entered by
driving Chip Select (S) Low, sending the instruc-
tion code, and then driving Chip Select (S) High.
The Write Enable Latch (WEL) bit is reset under
the following conditions:
–Power-up
–
Write Disable (WRDI) instruction completion
–
Page Write (PW) instruction completion
–
Page Program (PP) instruction completion
–
Page Erase (PE) instruction completion
–
Sector Erase (SE) instruction completion
Figure 9. Write Disable (WRDI) Instruction Sequence
C
D
AI02281E
S
Q
2
1
34567
High Impedance
0
Instruction
C
D
AI03750D
S
Q
2
1
34567
High Impedance
0
Instruction



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