參數(shù)資料
型號(hào)： AT80C51RA2-3CSIM
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(yè)數(shù)： 53/85頁(yè)
文件大?。?/td> 762K
代理商： AT80C51RA2-3CSIM
53
4188E–8051–08/06
AT/TS8xC51Rx2
9.
TS87C51RB2/RC2/RD2 EPROM
9.1
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.
9.2
EPROM Lock System
The program Lock system, when programmed, protects the on-chip program against software
piracy.
9.2.1
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, cre-
ating 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.
9.2.2
Program Lock Bits
The three lock bits, when programmed according to Table 9-1.9.2.3, will provide different level of
protection for the on-chip code and data.
Table 9-1.
Program Lock bits
U: unprogrammed,
P: programmed
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, 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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT80C51RA2-3CSIV 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontroller
AT80C51RA2-3CSUL 功能描述:8位微控制器 -MCU MICRO RLESS RA 40MHZ 3V COM TEMP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
AT80C51RA2-3CSUM 功能描述:8位微控制器 -MCU MICRO RLESS RA 40MHZ 5V COM TEMP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
AT80C51RA2-RLRUL 功能描述:8位微控制器 -MCU RLESS RA 40MHZ 3V COM TEMP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
AT80C51RA2-RLSIV 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontroller
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