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參數(shù)資料
| 型號： | T83C5101ZZZ-3ZSIL |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁數(shù)： | 28/52頁 |
| 文件大?。?/td> | 701K |
| 代理商： | T83C5101ZZZ-3ZSIL |
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34
Rev. F - 12 March, 2001
T87C5101
T83C5101/02
9. T87C5101 EPROM
9.1. EPROM Structure
The T87C5101 EPROM is divided into two different arrays:
the code array: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Kbytes.
the encryption array: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 bytes.
In addition a third non programmable array is implemented:
the signature array: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 bytes.
9.2. EPROM Lock System
The program Lock system, when programmed, protects the on-chip program against software piracy.
9.2.1. 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.
9.2.2. Program Lock Bits
The three lock bits, when programmed according to Table 16., will provide different level of protection for the
on-chip code and data.
U: unprogrammed,
P: programmed
WARNING: Security level 2 and higher should only be programmed after EPROM verification.
9.2.3. Signature bytes
The T8xC5101/02 family contains 4 factory programmed signatures bytes. To read these bytes, perform the process
described in section 9.3.2. and 9.5.1. .
Table 16. Program Lock bits
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.
2
P
U
Further programming of the program memory is disabled.
3
U
P
U
Same as security level 2 + verify disabled.
4
U
P
Not applicable as usually this protection deals with external execution, which is impos-
sible with this device.
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