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TS87C51RD2解密

    在单片机解密的侵入式攻击技术手法中,解密工程师先将芯片上面的塑料用小刀揭开,芯片周围的环氧树脂可以用浓硝酸腐蚀掉。热的浓硝酸会溶解掉芯片封装而不会影响芯片及连线。该过程一般在非常干燥的条件下进行,因为水的存在可能会侵蚀已暴露的铝线连接 (这就可能造成解密失败)。接着在超声池里先用丙酮清洗该芯片以除去残余硝酸,并浸泡。
  最后一步是寻找保护熔丝的位置并将保护熔丝暴露在紫外光下。一般用一台放大倍数至少100倍的显微镜,从编程电压输入脚的连线跟踪进去,来寻找保护熔丝。若没有显微镜,则采用将芯片的不同部分暴露到紫外光下并观察结果的方式进行简单的搜索。操作时应用不透明的纸片覆盖芯片以保护程序存储器不被紫外光擦除。将保护熔丝暴露在紫外光下5~10分钟就能破坏掉保护位的保护作用,之后,使用简单的编程器就可直接读出程序存储器的内容。
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  TS87C51RD2 概述
  Atmel TS8xC51Rx2 is a high performance CMOS ROM, OTP, EPROM and ROMless versions of the 80C51 CMOS single chip 8-bit microcontroller.
  The TS8xC51Rx2 retains all features of the 80C51 with extended ROM/EPROM capacity (16/32/64 Kbytes), 256 bytes of internal RAM, a 7-source , 4-level interrupt system, an on-chip oscilator and three timer/counters.
  In addition, the TS80C51Rx2 has a Programmable Counter Array, an XRAM of 256 or 768 bytes, a Hardware Watchdog Timer, a more versatile serial channel that facilitates multiprocessor communication (EUART) and an X2 speed improvement mechanism.
  The fully static design of the TS80C51Rx2 allows to reduce system power consumption by bringing the clock frequency down to any value, even DC, without loss of data.
  The TS80C51Rx2 has 2 software-selectable modes of reduced activity for further reduction in power consumption. In the idle mode the CPU is frozen while the timers, the serial port and the interrupt system are still operating. In the power-down mode the RAM is saved and all other functions are inoperative.
  TS87C51RD2 特性
  80C52 Compatible
  – 8051 pin and instruction compatible
  – Four 8-bit I/O ports
  – Three 16-bit timer/counters
  – 256 bytes scratchpad RAM
  High-Speed Architecture
  – 40 MHz @ 5V, 30MHz @ 3V
  – X2 Speed Improvement capability (6 clocks/machine cycle)
  – 30 MHz @ 5V, 20 MHz @ 3V (Equivalent to
  – 60 MHz @ 5V, 40 MHz @ 3V)
  Dual Data Pointer
  On-chip ROM/EPROM (16K-bytes, 32K-bytes, 64K-bytes)
  On-chip eXpanded RAM (XRAM) (256 or 768 bytes)
  Programmable Clock Out and Up/Down Timer/Counter 2
  Programmable Counter Array with
  – High Speed Output,
  – Compare / Capture,
  – Pulse Width Modulator,
  – Watchdog Timer Capabilities
  Hardware Watchdog Timer (One-time enabled with Reset-Out)
  2 extra 8-bit I/O ports available on RD2 with high pin count packages
  Asynchronous port reset
  Interrupt Structure with
  – 7 Interrupt sources,
  – 4 level priority interrupt system
  Full duplex Enhanced UART
  – Framing error detection
  – Automatic address recognition
  Low EMI (inhibit ALE)
  Power Control modes
  – Idle mode
  – Power-down mode
  – Power-off Flag
  Once mode (On-chip Emulation)
  Power supply: 4.5-5V, 2.7-5.5V
  Temperature ranges: Commercial (0 to 70oC) and Industrial (-40 to 85oC)
  Packages: PDIL40, PLCC44, VQFP44 1.4, PLCC68, VQFP64 1.4