在芯片解密、单片机解密、IC解密过程中，对于使用了防护层来保护ＥＥＰＲＯＭ单元的单片机来说，使用紫外光复位保护电路是不可行的。对于这种类型的单片机，一般使用微探针技术来读取存储器内容。在芯片封装打开后，将芯片置于显微镜下就能够很容易的找到从存储器连到电路其它部分的数据总线。由于某种原因，芯片锁定位在编程模式下并不锁定对存储器的访问。利用这一缺陷将探针放在数据线的上面就能读到所有想要的数据。在编程模式下，重启读过程并连接探针到另外的数据线上就可以读出程序和数据存储器中的所有信息。
深圳芯片解密研究所提供各类型单片机解密服务，有AT89C2051x2解密需求者请直接与我们联系：
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AT89C2051x2 Description
The AT89C2051x2 is a low-voltage, high-performance CMOS 8-bit microcomputer with 2K bytes of Flash programmable memory. The device is manufactured using Atmel抯 high-density nonvolatile memory technology and is compatible with the industry- standard MCS-51 instruction set. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C2051x2 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications.
The AT89C2051x2 provides the following standard features: 2K bytes of Flash, 128 bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five-vector, two-level interrupt architecture, a full duplex serial port, a precision analog comparator, on-chip oscillator and clock circuitry. In addition, the AT89C2051x2 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset.Furthermore, the AT89C2051x2 executes one machine cycle in 6 clock cycles, providing twice the speed of the AT89C2051 device. The user gains the flexibility to divideinput frequency crystals by 2 (less expensive components), while keeping the same CPU power. Alternatively, the user can save on power consumption while keeping the same CPU power (oscillator power saving).
AT89C2051x2 Features
Compatible with MCS-51?Products
2K Bytes of Reprogrammable Flash Memory
Endurance: 1,000 Write/Erase Cycles
2.7V to 6V Operating Range
Fully Static Operation: 0 Hz to 12 MHz
Two-level Program Memory Lock
128 x 8-bit Internal RAM
15 Programmable I/O Lines
Two 16-bit Timer/Counters
Six Interrupt Sources
Programmable Serial UART Channel
Direct LED Drive Outputs
On-chip Analog Comparator
Low-power Idle and Power-down Modes
6 Clocks per Machine Cycle Operation
