at49lh004 ATMEL Corporation, at49lh004 Datasheet - Page 21

• Manufacturer Part Number: at49lh004
• Description: 4-megabit Firmware Hub And Low-pin Count Flash Memory
• Manufacturer: ATMEL Corporation

Table 11-3.
Table 11-4.
3383D–FLASH–6/05
7:3
Bit
2
1
0
Data
07H
06H
05H
04H
03H
02H
01H
00H
Function of Sector Locking Bits
Valid Sector Locking Register Values
Lock-Down
Read-Lock
Write-Lock
Reserved
Name
Sector is read and write locked down.
Sector is read locked down.
Sector is read and write locked but not locked down.
Sector is read locked but not locked down.
Sector is write locked down.
Sector is locked open (full access locked down).
Sector is write locked but not locked down. This is the default state.
Sector is open for full access.
Resulting Sector State
Description
Reserved for future use.
0
1
0
1
0
1
Sector is not read-locked.
Normal read operations in the sector can occur. This is the default state.
Sector is read-locked.
Read operations within the sector are prevented. Data read will be 00H.
Sector is not locked down.
The Read-Lock and Write-Lock bits may be changed. This is the default state.
Sector is locked down.
The Read-Lock and Write-Lock bits cannot be changed. Once the sector is locked down, it will
remain locked down until the device is reset (using the RST or INIT signals) or power-cycled.
Sector is not write-locked.
Normal program and erase operations to the sector can occur.
Sector is write-locked.
Program and erase operations to the sector are prevented. This is the default state.
AT49LH004
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