IC解密、单片机解密、芯片解密的过错产生技术是使用异常工作条件来使处理器出错，然后提供额外的访问来进行攻击。使用最广泛的过错产生攻击手段包括电压冲击和时钟冲击。低电压和高电压攻击可用来禁止保护电路工作或强制处理器执行错误操作。时钟瞬态跳变也许会复位保护电路而不会破坏受保护信息。电源和时钟瞬态跳变可以在某些处理器中影响单条指令的解码和执行。
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AT87C54X2 概述
TS80C54/58X2 is high performance CMOS ROM, OTP and EPROM versions of the 80C51 CMOS single chip 8-bit microcontroller.
The TS80C54/58X2 retains all features of the Atmel 80C51 with extended ROM/EPROM capacity (16/32 Kbytes), 256 bytes of internal RAM, a 6-source , 4-level interrupt system, an on-chip oscilator and three timer/counters. In addition, the TS80C54/58X2 a Hardware Watchdog Timer, a more versatile serial channel that facilitates multiprocessor communication (EUART) and a X2 speed improvement mechanism. The fully static design of the TS80C54/58X2 allows to reduce system power consumption by bringing the clock frequency down to any value, even DC, without loss of data.
The TS80C54/58X2 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.
AT87C54X2 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)
Programmable Clock Out and Up/Down Timer/Counter 2
Hardware Watchdog Timer (One-time enabled with Reset-Out)
Asynchronous port reset
Interrupt Structure with
6 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: 4.5-5.5V, 2.7-5.5V
Temperature ranges: Commercial (0 to 70oC) and Industrial (-40 to 85oC)
Packages: PDIL40, PLCC44, VQFP44 1.4, PQFP44 F1, CQPJ44 (window), CDIL40
(window)
