芯片解密、单片机解密的软解密技术通常使用处理器通信接口并利用协议、加密算法或这些算法中的安全漏洞来进行攻击。软件攻击取得成功的一个典型事例是对早期ＡＴＭＥＬ ＡＴ８９Ｃ 系列单片机的攻击。攻击者利用了该系列单片机擦除操作时序设计上的漏洞，使用自编程序在擦除加密锁定位后，停止下一步擦除片内程序存储器数据的操作，从而使加过密的单片机变成没加密的单片机，然后利用编程器读出片内程序。
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AT87C51RD2 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.
AT87C51RD2 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
