方案设计图：

方案关键器件表：

　　Features

　　•Compatible with MCS®-51 Products

　　•8K Bytes of In-System Programmable (ISP) Flash Memory

　　–Endurance: 1000 Write/Erase Cycles

　　•4.0V to 5.5V Operating Range

　　•Fully Static Operation: 0 Hz to 33 MHz

　　•Three-level Program Memory Lock

　　•256 x 8-bit Internal RAM

　　•32 Programmable I/O Lines

　　•Three 16-bit Timer/Counters

　　•Eight Interrupt Sources

　　•Full Duplex UART Serial Channel

　　•Low-power Idle and Power-down Modes

　　•Interrupt Recovery from Power-down Mode

　　•Watchdog Timer

　　•Dual Data Pointer

　　•Power-off Flag

　　•Fast Programming Time

　　•Flexible ISP Programming (Byte and Page Mode)• Green (Pb/Halide-free) Packaging Option

　　1.Description

　　The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the indus-try-standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory pro-grammer. By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.The AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S52 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 con-tents but freezes the oscillator, disabling all other chip functions until the next interrupt or hardware reset

　　Atmel 公司为全球性的业界领先企业，致力于设计和制造各类微控制器、电容式触摸解决方案、先进逻辑、混合信号、非易失性存储器和射频 (RF) 元件。凭借业界最广泛的知识产权 (IP) 技术组合之一，Atmel 为电子行业提供针对工业、消费、安全、通信、计算和汽车市场的全面的系统解决方案。

　　ATMEL在系统级集成方面所拥有的世界级专业知识和丰富的经验使其产品可以在现有模块的基础上进行开发，保证最小的开发延期和风险。凭借业界最广泛的知识产权(IP)组合，Atmel提供电子系统完整的系统解决方案的厂商。

　　Atmel公司的股票代码为“ATML.O”在纳斯达克股票市场上市。ATMEL公司是世界上高级半导体产品设计、制造和行销的领先者，产品包括了微处理器、可编程逻辑器件、非易失性存储器、安全芯片、混合信号及RF射频集成电路。通过这些核心技术的组合，ATMEL生产出了各种通用目的及特定应用的系统级芯片，以满足当今电子系统设计工程师不断增长和演进的需求。

　　通过分布于超过60个国家的生产、工程、销售及分销网络，ATMEL承诺面向客户，为北美、欧洲和亚洲的电子市场服务。确保及时介绍产品以及对客户持续的支持已经使ATMEL的产品成为最新电子产品的核心器件。这些产品进而帮助最终用户完成更多的工作，享受更多的便利并保持与外界的沟通，不论身在何处。ATMEL帮助客户设计更小、更便宜、更多特性的产品来领导市场。

　　2016年被美国芯片制造商微芯科技(Microchip Technology)宣布以36亿美元收购。