參數資料
型號: TS80C54X2
廠商: Atmel Corp.
英文描述: 8-bit CMOS Microcontroller 16/32 Kbytes ROM/OTP
中文描述: 8位CMOS微控制器16/32字節(jié)ROM /雙層
文件頁數: 36/58頁
文件大?。?/td> 1039K
代理商: TS80C54X2
36
Rev. C - 15 January, 2001
TS80C54X2/C58X2
TS87C54X2/C58X2
8. TS87C54/58X2 EPROM
8.1 EPROM Structure
The TS87C54/58X2 EPROM is divided in two different arrays:
G
the code array: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16/32 Kbytes.
G
the encryption array: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64 bytes.
In addition a third non programmable array is implemented:
G
the signature array: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 bytes.
8.2 EPROM Lock System
The program Lock system, when programmed, protects the on-chip program against software piracy.
8.2.1 Encryption Array
Within the EPROM array are 64 bytes of encryption array that are initially unprogrammed (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 programmed with random values. This will ensure program protection.
8.2.2 Program Lock Bits
The three lock bits, when programmed according to Table 21., will provide different level of protection for the
on-chip code and data.
Table 21. Program Lock bits
U: unprogrammed,
P: programmed
WARNING: Security level 2 and 3 should only be programmed after EPROM and Core verification.
Program Lock Bits
Protection description
Security
level
LB1
LB2
LB3
1
U
U
U
Noprogramlockfeaturesenabled.Codeverifywillstillbeencryptedbytheencryption
array if programmed. MOVC instruction executed from external program memory
returns non encrypted data.
2
P
U
U
MOVCinstructionexecutedfromexternalprogrammemoryaredisabledfromfetching
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
U
P
Same as 3, also external execution is disabled.
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