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参数资料
| 型号： | TS87C51RD2-VIEB |
| 元件分类： | 8位微控制器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件页数： | 48/74页 |
| 文件大小： | 689K |
| 代理商： | TS87C51RD2-VIEB |
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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.
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 |
|---|---|
| TS87C51RD2-VIED | 8-BIT MICROCONTROLLER |
| TS87C51RD2-VILB | 8-BIT MICROCONTROLLER |
| TS87C51RD2-VILD | 8-BIT MICROCONTROLLER |
| TS87C51RD2-VILR | 8-BIT MICROCONTROLLER |
| TS87C51RD2-VIMB | 8-BIT MICROCONTROLLER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TS87C51RD2-VIED | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| TS87C51RD2-VIER | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| TS87C51RD2-VIL | 功能描述:IC MCU 8051 OTP 64K 5V 68PLCC RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:87C 标准包装:1,500 系列:AVR® ATtiny 核心处理器:AVR 芯体尺寸:8-位 速度:16MHz 连通性:I²C，LIN，SPI，UART/USART，USI 外围设备:欠压检测/复位，POR，PWM，温度传感器，WDT 输入/输出数:16 程序存储器容量:8KB（4K x 16） 程序存储器类型:闪存 EEPROM 大小:512 x 8 RAM 容量:512 x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:A/D 11x10b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 包装:带卷 (TR) |
| TS87C51RD2-VILB | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| TS87C51RD2-VILD | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
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