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參數(shù)資料
| 型號(hào)： | TS80C51RA2-LCMD |
| 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)： | 52/74頁(yè) |
| 文件大?。?/td> | 903K |
| 代理商： | TS80C51RA2-LCMD |
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52
Rev. C - 06 March, 2001
TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
8. TS87C51RB2/RC2/RD2 EPROM
8.1. EPROM Structure
The TS87C51RB2/RC2/RD2 EPROM is divided in two different arrays:
the code array: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16/32/64 Kbytes.
the encryption array: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 bytes.
In addition a third non programmable array is implemented:
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 29.8.2.3. , will provide different level of protection for
the on-chip code and data.
Table 29. Program Lock bits
U: unprogrammed,
P: programmed
WARNING: Security level 2 and 3 should only be programmed after EPROM and Core verification.
8.2.3. Signature bytes
The TS87C51RB2/RC2/RD2 contains 4 factory programmed signatures bytes. To read these bytes, perform the
process described in section 8.3.
Program Lock Bits
LB1
Protection description
Security level
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 |
|---|---|
| TS80C51RA2-LCMR | High Performance 8-bit Microcontrollers |
| TS80C51RA2-LIAB | High Performance 8-bit Microcontrollers |
| TS80C51RA2-LIAD | High Performance 8-bit Microcontrollers |
| TS80C51RA2-LIAR | High Performance 8-bit Microcontrollers |
| TS80C51RA2-MCMR | High Performance 8-bit Microcontrollers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS80C51RA2-LCMR | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-LCNB | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-LCND | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-LCNR | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers |
| TS80C51RA2-LIA | 功能描述:IC MCU 8BIT 256BYTE 30MHZ 44PLCC RoHS:否 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:80C 標(biāo)準(zhǔn)包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設(shè)備:POR，WDT 輸入/輸出數(shù):32 程序存儲(chǔ)器容量:32KB（32K x 8） 程序存儲(chǔ)器類(lèi)型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP（0.600"，15.24mm） 包裝:管件 |
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