參數(shù)資料
型號(hào)： TS87C52X2-MIJD
英文描述： 8-bit CMOS Microcontroller 0-60 MHz
中文描述： 8位CMOS微控制器0-60兆赫
文件頁(yè)數(shù)： 34/54頁(yè)
文件大小： 626K
代理商： TS87C52X2-MIJD
34
Rev. B - Jan. 25, 1999
Preliminary
TS80C52X2
8. TS87C52X2
8.1 EPROM Structure
The TS87C52X2 is divided in two different arrays:
G
the code array: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 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 19., will provide different level of protection for the
on-chip code and data.
Table 19. 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.
相關(guān)PDF資料
PDF描述
TS87C52X2-MIJR 8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-MIAB 8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-MIAD 8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-MIAR 8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-LIBB 8-bit CMOS Microcontroller 0-60 MHz
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TS87C52X2-MIJR 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-MIKB 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-MIKD 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-MIKR 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-SLSUM 制造商:Atmel Corporation 功能描述:MCU 8BIT TS87 CISC 8KB EPROM 44PLCC - Rail/Tube
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