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SST89E554-25-C-TQJ Datasheet(PDF) 41 Page - Silicon Storage Technology, Inc

No. de pieza SST89E554-25-C-TQJ
Descripción Electrónicos  FlashFlex51 MCU
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Fabricante Electrónico  SST [Silicon Storage Technology, Inc]
Página de inicio  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

SST89E554-25-C-TQJ Datasheet(HTML) 41 Page - Silicon Storage Technology, Inc

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Preliminary Specifications
FlashFlex51 MCU
SST89E564 / SST89V564 / SST89E554 / SST89V554
41
©2001 Silicon Storage Technology, Inc.
S71181-03-000
9/01
384
TABLE
8-1: SECURITY LOCK OPTIONS
Level
Security Lock Bits1,2
Security Status of:
Security Type
SFST[7:5]
SB1
SB21
SB31
Block 1
Block 0
1
000
U
U
U
Unlock
Unlock
No Security Features are Enabled.
2
100
P
U
U
SoftLock
SoftLock
MOVC instructions executed from
external program memory are dis-
abled from fetching code bytes from
internal memory, EA# is sampled and
latched on Reset, and further pro-
gramming of the flash is disabled.
3
011
101
U
P
P
U
P
P
Hard Lock
Hard Lock
Level 2 plus Verify disabled, both
blocks locked.
010
U
P
U
SoftLock
SoftLock
Level 2 plus Verify disabled. Code in
Block 1 may program Block 0 and vice
versa.
110
001
P
U
P
U
U
P
Hard Lock
SoftLock
Level 2 plus Verify disabled. Code in
Block 1 may program Block 0.
4
111
P
P
P
Hard Lock
Hard Lock
Same as Level 3 Hardlock/Hardlock,
but MCU will start code execution
from the internal memory regardless
of EA#.
T8-1.7 384
1. P = Programmed (Cell logic state = 0), U = Unprogrammed (Cell logic state = 1).
2. SFST[7:5] = Security Lock Decoding Bits (SECD)


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