參數(shù)資料
型號(hào)： TS87C51RC2-LCE
廠商： International Rectifier
英文描述： High Performance 8-bit Microcontroller
中文描述： 高性能8位微控制器
文件頁數(shù)： 51/85頁
文件大小： 762K
代理商： TS87C51RC2-LCE
51
4188E–8051–08/06
AT/TS8xC51Rx2
8.
TS83C51RB2/RC2/RD2 ROM
8.1
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.
8.2
ROM Lock System
The program Lock system, when programmed, protects the on-chip program against software
piracy.
8.2.1
8.2.1 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.
8.2.2
Program Lock Bits
The lock bits when programmed according to Table 8-1. will provide different level of protection
for the on-chip code and data.
Table 8-1.
Program Lock bits
U: unprogrammed
P: programmed
8.2.3
Signature bytes
The TS83C51RB2/RC2/RD2 contains 4 factory programmed signatures bytes. To read these
bytes, perform the process described in section 8.3.
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 array if programmed. MOVC instruction executed
from external program memory returns 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.
相關(guān)PDF資料
PDF描述
TS87C51RC2-LIB High Performance 8-bit Microcontroller
TS87C51RC2-LIE High Performance 8-bit Microcontroller
TS87C51RC2-MCB High Performance 8-bit Microcontroller
TS87C51RC2-MCE High Performance 8-bit Microcontroller
TS87C51RC2-MIB High Performance 8-bit Microcontroller
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TS87C51RC2-LCED 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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