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SST89E554

Flash flex 51 MCU

Silicon Storage Technology 

FlashFlex51 MCU

SST89E564 / SST89V564 / SST89E554 / SST89V554

Preliminary Specifications

TABLE

Level

1

2

8-1: SECURITY LOCK OPTIONS

Security Lock Bits1,2

SFST[7:5] SB1

SB21

000

U

U

100

P

U

SB31

U

U

Security Status of:

Block 1

Block 0

Unlock

Unlock

SoftLock

SoftLock

3

011

U

P

P Hard Lock Hard Lock

101

P

U

P

010

U

P

U SoftLock

SoftLock

110

P

P

U Hard Lock SoftLock

001

U

U

P

4

111

P

P

P Hard Lock Hard Lock

1. P = Programmed (Cell logic state = 0), U = Unprogrammed (Cell logic state = 1).

2. SFST[7:5] = Security Lock Decoding Bits (SECD)

Security Type

No Security Features are Enabled.

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.

Level 2 plus Verify disabled, both

blocks locked.

Level 2 plus Verify disabled. Code in

Block 1 may program Block 0 and vice

versa.

Level 2 plus Verify disabled. Code in

Block 1 may program Block 0.

Same as Level 3 Hardlock/Hardlock,

but MCU will start code execution

from the internal memory regardless

of EA#.

T8-1.7 384

©2001 Silicon Storage Technology, Inc.

41

S71181-03-000 9/01 384

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