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M50LPW040 Datasheet(PDF) 17 Page - STMicroelectronics

Part # M50LPW040
Description  4 Mbit 512Kb x8, Uniform Block 3V Supply Low Pin Count Flash Memory
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M50LPW040 Datasheet(HTML) 17 Page - STMicroelectronics

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M50LPW040
Table 15. Lock Register Bit Definitions(1)
Note: 1. Applies to Top Block Lock Register (T_BLOCK_LK) and Top Block [-1] Lock Register (T_MINUS01_LK) to Top Block [-7] Lock Reg-
ister (T_MINUS07_LK).
Table 16. General Purpose Input Register Definition(1)
Note: 1. Applies to the General Purpose Input Register (GPI_REG).
Bit
Bit Name
Value
Function
7-3
Reserved
2
Read-Lock
‘1’
Bus Read operations in this Block always return 00h.
‘0’
Bus read operations in this Block return the Memory Array contents. (Default
value).
1
Lock-Down
‘1’
Changes to the Read-Lock bit and the Write-Lock bit cannot be performed. Once a
‘1’ is written to the Lock-Down bit it cannot be cleared to ‘0’; the bit is always reset
to ‘0’ following a Reset (using RP or INIT) or after power-up.
‘0’
Read-Lock and Write-Lock can be changed by writing new values to them. (Default
value).
0
Write-Lock
‘1’
Program and Block Erase operations in this Block will set an error in the Status
Register. The memory contents will not be changed. (Default value).
‘0’
Program and Block Erase operations in this Block are executed and will modify the
Block contents.
Bit
Bit Name
Value
Function
7-5
Reserved
4
GPI4
‘1’
Input Pin GPI4 is at VIH
‘0’
Input Pin GPI4 is at VIL
3
GPI3
‘1’
Input Pin GPI3 is at VIH
‘0’
Input Pin GPI3 is at VIL
2
GPI2
‘1’
Input Pin GPI2 is at VIH
‘0’
Input Pin GPI2 is at VIL
1
GPI1
‘1’
Input Pin GPI1 is at VIH
‘0’
Input Pin GPI1 is at VIL
0
GPI0
‘1’
Input Pin GPI0 is at VIH
‘0’
Input Pin GPI0 is at VIL


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