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T89C5115-RATIM Folha de dados(PDF) 39 Page - ATMEL Corporation

Nome de Peças T89C5115-RATIM
Descrição Electrónicos  Low Pin Count 8-bit Microcontroller with A/D Converter and 16 KBytes Flash Memory
PDF  113 Pages
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C5115-RATIM Folha de dados(HTML) 39 Page - ATMEL Corporation

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AT89C5115
4128G–8051–02/08
Figure 17. Reading Procedure
Note:
aa = 10 for the Hardware Security Byte.
Flash Protection from Parallel
Programming
The three lock bits in Hardware Security Byte (See ’In-System Programming’ section)
are programmed according to Table 23 provide different level of protection for the on-
chip code and data located in FM0 and FM1.
The only way to write this bits are the parallel mode. They are set by default to level 3.
Table 23. Program Lock bit
Note:
1. Program Lock bits
U: unprogrammed
P: programmed
WARNING: Security level 2, 3 and 4 should only be programmed after Flash and Core
verification.
Preventing Flash Corruption
See Section “Power Management”.
Flash Spaces Reading
Flash Spaces Mapping
FCON = 00000aa0b
Data Read
DPTR = Address
ACC= 0
Exec: MOVC A, @A+DPTR
Clear Mode
FCON = 00h
Program Lock bits
Protection Description
Security
Level
LB0
LB1
LB2
1
U
U
U
No program lock features enabled.
2
P
U
U
Parallel programming of the Flash is disabled.
3
U
P
U
Same as 2, also verify through parallel programming interface is
disabled. This is the factory defaul programming.
4
U
U
P
Same as 3



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