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M25P40 数据表(PDF) 19 Page - STMicroelectronics

部件名 M25P40
功能描述  4 Mbit, low voltage, serial Flash memory with 50 MHz SPI bus interface
PDF  53 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

M25P40 数据表(HTML) 19 Page - STMicroelectronics

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M25P40
Instructions
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6.1
Write Enable (WREN)
The Write Enable (WREN) instruction (Figure 7) sets the Write Enable Latch (WEL) bit.
The Write Enable Latch (WEL) bit must be set prior to every Page Program (PP), Sector
Erase (SE), Bulk Erase (BE) and Write Status Register (WRSR) instruction.
The Write Enable (WREN) instruction is entered by driving Chip Select (S) Low, sending the
instruction code, and then driving Chip Select (S) High.
Figure 7.
Write Enable (WREN) instruction sequence
Table 4.
Instruction set
Instruction
Description
One-byte instruction
code
Address
bytes
Dummy
bytes
Data
bytes
WREN
Write Enable
0000 0110
06h
0
0
0
WRDI
Write Disable
0000 0100
04h
0
0
0
RDID(1)
1.
The Read Identification (RDID) instruction is available only in products with Process Technology code X
(see Application Note AN1995).
Read Identification
1001 1111
9Fh
0
0
1 to 3
RDSR
Read Status Register
0000 0101
05h
0
0
1 to
∞
WRSR
Write Status Register
0000 0001
01h
0
0
1
READ
Read Data Bytes
0000 0011
03h
3
0
1 to
∞
FAST_READ
Read Data Bytes at Higher
Speed
0000 1011
0Bh
3
1
1 to
∞
PP
Page Program
0000 0010
02h
3
0
1 to 256
SE
Sector Erase
1101 1000
D8h
3
0
0
BE
Bulk Erase
1100 0111
C7h
0
0
0
DP
Deep Power-down
1011 1001
B9h
0
0
0
RES
Release from Deep Power-
down, and Read Electronic
Signature
1010 1011
ABh
0
3
1 to
∞
Release from Deep Power-
down
0
0
0
C
D
AI02281E
S
Q
2
1
34567
High Impedance
0
Instruction



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