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下面是有关AT89C2051芯片的主要功能特征介绍，供客户及技术工程师在芯片解密项目及技术实现过程中进行技术参考和借鉴。
AT89C2051　　Features
　　Compatible with MCS-51Products
　　2K Bytes of Reprogrammable Flash Memory
　　- Endurance: 1,000 Write/Erase Cycles
　　2.7V to 6V Operating Range
　　Fully Static Operation: 0 Hz to 24 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
　　The AT89C2051 is a low-voltage, high-performance CMOS 8-bit microcomputer with
　　2K Bytes of Flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmel’s high density nonvolatile memory technology and is compatible with the industry standard MCS-51instruction set. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C2051 is a pow- erful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications.
　　The AT89C2051 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 AT89C2051 is designed with static logic for opera- tion 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.
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