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SST89E554-25-C-TQJ Datasheet(PDF) 41 Page - Silicon Storage Technology, Inc |
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SST89E554-25-C-TQJ Datasheet(HTML) 41 Page - Silicon Storage Technology, Inc |
41 / 58 page 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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