AT89C55WD 带20K系统内可编程Flash 存储器

Flash (Kbytes)	20
RAM (Bytes)	256
F.max (MHz)	33
Vcc (V)	4.0-6.0
I/O Pins	32
UART	1
16-bit Timers	3
Watchdog	Yes
Pb-Free Packages	TQFP44 PDIP40 PLCC44

AT89C55WD 概述

The AT89C55WD is a low-power, high-performance CMOS 8-bit microcontroller with 20K bytes of Flash programmable read only memory and 256 bytes of RAM. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry standard 80C51 and 80C52 instruction set and pinout. The on-chip Flash allows the program memory to be user programmed by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C55WD is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded controlapplications. The AT89C55WD provides the following standard features: 20K bytes of Flash, 256 bytes of RAM, 32 I/O lines, 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 AT89C55WD 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 external interrupt or hardware reset.

AT89C55WD是一个低电压，高性能CMOS 8位单片机，片内含20k bytes的可反复擦写的Flash只读程序存储器和256bytes的随机存取数据存储器（RAM），器件采用ATMEL公司的高密度、非易失性存储技术生产，兼容标准MCS-51指令系统，引脚兼容工业标准89C51和89C52芯片，采用通用编程方式，片内置通用8位中央处理器和Flash存储单元，内置功能强大的微处理器的AT89C52可为您提供许多高性价比的解决方案，适用于多数嵌入式应用系统。 AT89C55WD有40个引脚，32个外部双向输入/输出（I/O）端口，同时内含2个外中断口，2个16位可编程定时计数器,2个全双工串行通信口，2个读写口线，片内时钟电路，AT89C55WD采用两种软件控制其进入省电睡眠模式的静态逻辑工作闲置方式设计，可以用RAM、定时/计数器、串行口和外部中断唤醒睡眠状态而继续工作，在睡眠模式下，RAM被冻结，其他功能全部停止，直至下个外中断触发或硬件复位方可开始运行。特别是可反复擦写的Flash存储器可有效地降低开发成本。 AT89C55WD有具有PLCC、PDIP和TQFP三种封装形式，以适应不同产品的需求。

AT89C55WD 特性

Compatible with MCS®-51 Products 20K Bytes of Reprogrammable Flash Memory Endurance: 1000 Write/Erase Cycles 4V 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 Programmable Serial Channel Low-power Idle and Power-down Modes Interrupt Recovery from Power-down Mode Hardware Watchdog Timer Dual Data Pointer Power-off Flag Green (Pb/Halide-free) Packaging Option

兼容MCS51指令系统 32个双向I/O口 3个16位可编程定时/计数器中断 2个串行中断 2个外部中断源 2个读写中断口线 片内时钟电路 4-5.5V工作电压范围 20k可反复擦写(>1000次）Flash ROM 256x8bit内部RAM 时钟频率0-33MHz 硬件看门狗（WDT） 可编程串行通道 3级加密位 低功耗睡眠功能 软件设置睡眠外中断唤醒功能

AT89C55WD 订购型号

Speed (MHz)	Power Supply	Ordering Code	Package	Operation Range
24	4.0V to 5.5V	AT89C55WD-24AU AT89C55WD-24JU AT89C55WD-24PU	44A 44J 40P6	Industrial (-40°C to 85°C)

AT89C55WD 单片机应用技术支持与电子电路设计开发资源下载

1. AT89C55WD数据手册DataSheet 下载. PDF
2. 80C51微控制器的复位输入. PDF (编号: Tech 8051 00049)
3. 80C51在系统Flash编程. PDF (编号:8051 00050)