AT52BC6402AT Ver la hoja de datos (PDF) - Atmel Corporation
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AT52BC6402AT Datasheet PDF : 38 Pages
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3441B–STKD–11/04
AT52BC6402A(T)
Table 1. Hardlock and Softlock Protection Configurations in Conjunction with WP
VPP
VCC/5V
VCC/5V
Erase/
Hard- Soft-
Prog
WP
lock
lock
Allowed? Comments
0
0
0
Yes
No sector is locked
0
0
1
No
Sector is Softlocked. The Unlock
command can unlock the sector.
VCC/5V
0
1
1
No
Hardlock protection mode is
enabled. The sector cannot be
unlocked.
VCC/5V
1
0
0
VCC/5V
1
0
1
Yes
No sector is locked.
No
Sector is Softlocked. The Unlock
command can unlock the sector.
VCC/5V
1
1
0
Yes
Hardlock protection mode is
overridden and the sector is not
locked.
VCC/5V
1
1
1
No
Hardlock protection mode is
overridden and the sector can be
unlocked via the Unlock command.
VIL
x
x
x
No
Erase and Program Operations
cannot be performed.
Figure 1. Sector Locking State Diagram
UNLOCKED
LOCKED
A
[000]
C
WP = VIL = 0
B
[001]
C
Power-Up/Reset
Default
[011]
Hardlocked
A
[110]
WP = VIH = 1
A
[100]
B
C
B
[111]
Hardlocked is disabled by
WP = VIH
C
Power-Up/Reset
Default
[101]
A = Unlock Command
B = Softlock Command
C = Hardlock Command
Note:
1. The notation [X, Y, Z] denotes the locking state of a sector. The current locking state
of a sector is defined by the state of WP and the two bits of the sector-lock status
D[1:0].
5
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