參數(shù)資料
型號： TS87C52X2-VIAD
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
文件頁數(shù)： 34/54頁
文件大?。?/td> 626K
代理商： TS87C52X2-VIAD
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-VIAR 8-bit CMOS Microcontroller 0-60 MHz
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TS87C52X2-VCED 8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-VCER 8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-VCJB 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-VIAR 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-VIB 功能描述:IC MCU 8BIT 8K OTP 40MHZ 44-PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:87C 標(biāo)準(zhǔn)包裝:1,500 系列:AVR® ATtiny 核心處理器:AVR 芯體尺寸:8-位 速度:16MHz 連通性:I²C，LIN，SPI，UART/USART，USI 外圍設(shè)備:欠壓檢測/復(fù)位，POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):16 程序存儲器容量:8KB（4K x 16） 程序存儲器類型:閃存 EEPROM 大小:512 x 8 RAM 容量:512 x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 11x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:帶卷 (TR)
TS87C52X2-VIBB 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-VIBD 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-VIBR 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:8-bit CMOS Microcontroller 0-60 MHz
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