參數(shù)資料
型號(hào)： TS83C51RB2
廠商： Atmel Corp.
英文描述： High Performance 8-bit Microcontrollers
中文描述： 高性能8位微控制器
文件頁(yè)數(shù)： 51/74頁(yè)
文件大?。?/td> 903K
代理商： TS83C51RB2
Rev. C - 06 March, 2001
51
TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
7. TS83C51RB2/RC2/RD2 ROM
7.1. ROM Structure
The TS83C51RB2/RC2/RD2 ROM memory is divided in three different arrays:
the code array: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16/32/64 Kbytes.
the encryption array:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 bytes.
the signature array:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 bytes.
7.2. ROM Lock System
The program Lock system, when programmed, protects the on-chip program against software piracy.
7.2.1. 7.2.1. Encryption Array
Within the ROM 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.
7.2.2. Program Lock Bits
The lock bits when programmed according to Table 28. will provide different level of protection for the on-chip
code and data.
Table 28. Program Lock bits
U: unprogrammed
P: programmed
7.2.3. Signature bytes
The TS83C51RB2/RC2/RD2 contains 4 factory programmed signatures bytes. To read these bytes, perform the
process described in section 8.3.
7.2.4. Verify Algorithm
Refer to 8.3.4.
Program Lock Bits
Protection description
Security
level
LB1
LB2
LB3
1
U
U
U
No program lock features enabled. Code verify will still be encrypted by the encryption
arrayifprogrammed.MOVCinstruction executedfromexternalprogrammemoryreturns
non encrypted data.
2
P
U
U
MOVC instruction executed from external program memory are disabled from fetching
code bytes from internal memory, EA is sampled and latched on reset.
3
U
P
U
Same as level 1+ Verify disable.
This security level is only available for 51RDX2 devices.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TS83C51RB-20 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
TS83C51RB-24 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
TS83C51RB2-LCA 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontroller
TS83C51RB2-LCB 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontroller
TS83C51RB2-LCBR 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
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