參數(shù)資料
型號： M50FLW080AN5G
廠商： STMICROELECTRONICS
元件分類： PROM
英文描述： 1M X 8 FLASH 3V PROM, 11 ns, PDSO40
封裝： 10 X 20 MM, ROHS COMPLIANT, PLASTIC, TSOP-40
文件頁數(shù)： 30/64頁
文件大小： 534K
代理商： M50FLW080AN5G
Firmware Hub/low-pin-count (FWH/LPC) interface Configuration Registers
M50FLW080A,
6.1.3
Lock Down
The Lock Down Bit provides a mechanism for protecting software data from simple hacking
and malicious attack. When the Lock Down Bit is set, ‘1’, further modification to the Write
Lock, Read Lock and Lock Down Bits cannot be performed. A reset, or power-up, is required
before changes to these bits can be made. When the Lock Down Bit is reset, ‘0’, the Write
Lock, Read Lock and Lock Down Bits can be changed.
1.
In LPC mode, a most significant nibble, F, must be added to the memory address. For all registers, A22=0,
and the remaining address bits should be set according to the rules shown in the ADDR field of Table 6 to
Table 15.
Configuration Register map
Mnemonic
Register Name
Memory
Address
Default
Value
Access
Lock Registers (For details, see Appendix A)
GPI_REG
Firmware Hub/Low Pin Count (FWH/LPC)
General Purpose Input Register
FBC0100h
N/A
R
MANU_REG
Manufacturer Code Register
FBC0000h
20h
R
Table 16.
Lock Register bit definitions
Bit
Bit Name
Value
Function(1)
1.
Applies to the registers that are defined in Table 34 and Table 35.
7-3
Reserved
2
Read-Lock
‘1’
Bus Read operations in this Block or Sector always return 00h.
‘0’
Bus read operations in this Block or Sector 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).
0Write-Lock
‘1’
Program and Erase operations in this Block or Sector will set an error
in the Status Register. The memory contents will not be changed.
(Default value).
‘0’
Program and Erase operations in this Block or Sector are executed
and will modify the Block or Sector contents.
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