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M95128-R Datasheet(PDF) 11 Page - STMicroelectronics

Part # M95128-R
Description  128-Kbit serial SPI bus EEPROM with high-speed clock
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M95128-R Datasheet(HTML) 11 Page - STMicroelectronics

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6
Instructions
Each command is composed of bytes (MSBit transmitted first), initiated with the instruction byte, as summarized
in Table 4.
If an invalid instruction is sent (one not contained in Table 4), the device automatically enters in a Wait state until
deselected.
Table 4. Instruction set
Instruction
Description
Instruction format
WREN
Write enable
0000 0110
WRDI
Write disable
0000 0100
RDSR
Read Status register
0000 0101
WRSR
Write Status register
0000 0001
READ
Read from Memory array
0000 0011
WRITE
Write to Memory array
0000 0010
RDID (1)
Read Identification page
1000 0011
WRID(1)
Write Identification page
1000 0010
RDLS(1)
Reads the Identification page lock status
1000 0011
LID(1)
Locks the Identification page in read-only mode
1000 0010
1. Instruction available only for the M95128-D device.
For read and write commands to memory array and Identification page the address is defined by two bytes as
explained in Table 5.
Table 5. Significant bits within the address bytes
Instruction
MSB address byte
LSB address byte
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
READ
or WRITE
x
x
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
RDID
or WRID
0
0
0
0
0
0
0
0
0
0
A5
A4
A3
A2
A1
A0
RDLS
or LID
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
Note:
A: Significant address bit.
x: bit is Don’t care.
M95128-W M95128-R M95128-DF
Instructions
DS1356 - Rev 20
page 11/48



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