參數(shù)資料
型號(hào)： TS87C51RC2-MIB
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
文件頁數(shù)： 53/85頁
文件大?。?/td> 762K
代理商： TS87C51RC2-MIB
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.
相關(guān)PDF資料
PDF描述
TS87C51RC2-MIE High Performance 8-bit Microcontroller
TS87C51RC2-VCB High Performance 8-bit Microcontroller
TS87C51RC2-VCE High Performance 8-bit Microcontroller
TS87C51RC2-VIB High Performance 8-bit Microcontroller
TS87C51RC2-VIE High Performance 8-bit Microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TS87C51RC2-MIBB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
TS87C51RC2-MIBD 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
TS87C51RC2-MIBR 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
TS87C51RC2-MIE 功能描述:IC MCU 8BIT 32K OTP 40MHZ 44VQFP 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(cè)/復(fù)位，POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):16 程序存儲(chǔ)器容量:8KB（4K x 16） 程序存儲(chǔ)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)
TS87C51RC2-MIEB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*