參數(shù)資料
型號(hào)： TS80C32X2-LIA
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 30 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 26/55頁
文件大?。?/td> 596K
代理商： TS80C32X2-LIA
32
TS8xCx2X2
4184I–8051–02/08
EPROM Structure
The TS87C52X2 is divided in two different arrays:
the code array: 8 Kbytes
the encryption array: 64 bytes
In addition a third non programmable array is implemented:
the signature array: 4 bytes
EPROM Lock System
The program Lock system, when programmed, protects the on-chip program against
software piracy.
Encryption Array
Within the EPROM array are 64 bytes of encryption array that are initially unpro-
grammed (all FF’s). Every time a byte is addressed during program verify, 6 address
lines are used to select a byte of the encryption array. This byte is then exclusive-
NOR’ed (XNOR) with the code byte, creating an encrypted verify byte. The algorithm,
with the encryption array in the unprogrammed state, will return the code in its original,
unmodified form.
When using the encryption array, one important factor needs to be considered. If a byte
has the value FFh, verifying the byte will produce the encryption byte value. If a large
block (>64 bytes) of code is left unprogrammed, a verification routine will display the
content of the encryption array. For this reason all the unused code bytes should be pro-
grammed with random values. This will ensure program protection.
Program Lock Bits
The three lock bits, when programmed according to Table 1., will provide different level
of protection for the on-chip code and data.
U: unprogrammed
P: programmed
WARNING: Security level 2 and 3 should only be programmed after EPROM and Core
verification.
Signature Bytes
The TS80/87C52X2 contains 4 factory programmed signatures bytes. To read these
bytes, perform the process described in section 9.
EPROM Programming
Set-up modes
In order to program and verify the EPROM or to read the signature bytes, the
TS87C52X2 is placed in specific set-up modes (See Figure 11.).
Program Lock Bits
Protection Description
Security
level
LB1
LB2
LB3
1
U
No program lock features enabled. Code verify will still be
encrypted by the encryption array if programmed. MOVC
instruction executed from external program memory returns non
encrypted data.
2
P
U
MOVC instruction executed from external program memory are
disabled from fetching code bytes from internal memory, EA is
sampled and latched on reset, and further programming of the
EPROM is disabled.
3
U
P
U
Same as 2, also verify is disabled.
4
U
P
Same as 3, also external execution is disabled.
相關(guān)PDF資料
PDF描述
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