- 您现在的位置：买卖IC网 > PDF目录244164 > TS80C51RD2-EER (ATMEL CORP) 8-BIT, MICROCONTROLLER, PQFP44 PDF资料下载
参数资料
| 型号： | TS80C51RD2-EER |
| 厂商： | ATMEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MICROCONTROLLER, PQFP44 |
| 封装： | 1.40 MM HEIGHT, VQFP-44 |
| 文件页数： | 48/74页 |
| 文件大小： | 689K |
| 代理商： | TS80C51RD2-EER |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页当前第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页
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.
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.
Table 29. Program Lock bits
Program Lock Bits
Protection description
Security level
LB1
LB2
LB3
1
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
MOVC instruction executed from external program memory are disabled from fetching
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
P
Same as 3, also external execution is disabled.
相关PDF资料 |
PDF描述 |
|---|---|
| TS87C51RB2-LCEB | 8-BIT, OTPROM, 30 MHz, MICROCONTROLLER, PQFP44 |
| TS87C51RD2-EED | 8-BIT, OTPROM, MICROCONTROLLER, PQFP44 |
| TS87C51RD2-MCBB | 8-BIT, OTPROM, 40 MHz, MICROCONTROLLER, PQCC44 |
| TS87C51RD2-VCBB | 8-BIT, OTPROM, 40 MHz, MICROCONTROLLER, PQCC44 |
| TMS320LC542PBK-40 | 16-BIT, 100 MHz, OTHER DSP, PQFP128 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TS80C51RD2-ELB | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| TS80C51RD2-ELD | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| TS80C51RD2-ELR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| TS80C51RD2-EMB | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| TS80C51RD2-EMD | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
发布紧急采购，3分钟左右您将得到回复。