AT89S8252
Description 概术
兼容标准MCS-51指令系统的AT89S8252单片机是一个低电压,高性能CMOS 8位单片机,片内含8k bytes的可反复擦写的只读程序存储器（PEROM）和256 bytes的随机存取数据存储器（RAM）,SPI串行口用于编程向下装载,器件采用ATMEL公司的高密度、非易失性存储技术生产,片内置通用8位中央处理器和Flash存储单元,功能强大的AT89S8252单片机可为您提供许多高性低比的系统控制应用领域。
AT89S8252是一个低电压,高性能CMOS 8位单片机,片内含8k bytes的可反复擦写的Flash只读程序存储器和256 bytes的随机存取数据存储器（RAM）,SPI串行口用于编程向下装载,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,片内置通用8位中央处理器和Flash存储单元,功能强大的AT89S8252单片机可为您提供许多较复杂系统控制应用场合。
AT89S8252有40个引脚,32个外部双向输入/输出（I/O）端口,9个中断源,内含2个外中断口,3个16位可编程定时计数器,可编程UART串行通信口,SPI串行口,AT89S8252可以按照常规方法进行编程,也可以在线编程。其将通用的微处理器和Flash存储器结合在一起,特别是可反复擦写的Flash存储器可有效地降低开发成本。 AT89S8252有PDIP、TQFP及PLCC等三种封装形式,以适应不同应用系统的需求。
The AT89S8252 is a low-power, high-performance CMOS 8-bit microcomputer with 8K bytes of downloadable Flash programmable and erasable read only memory and 2K bytes of EEPROM. The device is manufactured using Atmel's high-density nonvola t i l e memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. The on-chip downloadable Flash allows the program memo r y to be reprogrammed in-system through an SPI serial interface or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with downloadable Flash on a monolithic chip, the Atmel AT89S8252 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications.
The AT89S8252 provides the following standard features: 8K bytes of downloadable Flash, 2K bytes of EEPROM, 256 bytes of RAM, 32 I/O lines, programmable watchd o g 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 AT89S8252 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 syste m to continue functioning.
The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next interrupt or hardware reset. The downloadable Flash can be changed a single byte at a time and is accessible through the SPI serial interface. Holding RESET active forces the SPI bus into a serial programming interface and allows the program memory to be written to or read from unless Lock Bit 2 has been activated.
Features 特性：
- 兼容MCS—51指令系统
- 8k可反复擦写(>1000次）Flash ROM
- 32个双向I/O口
- 256x8bit内部RAM
- 3个16位可编程定时/计数器中断
- 全静态操作0-24MHz
- SPI串行口
- 4.0-6.0V工作电压范围
- 2个外部中断源
- 可编程UART串行通道
- 2个读写中断口线
- 3级加密位
- 低功耗空闲和掉电功能
- 两种软件设置睡眠和唤醒功能
- Compatible with MCS-51TM Products ·
- 8K Bytes of In-System Reprogrammable Downloadable Flash Memory
SPI Serial Interface for Program Downloading
Endurance: 1,000 Write/Erase Cycles - 2K Bytes EEPROM
Endurance: 100,000 Write/Erase Cycles - 4V to 6V Operating Range
- Fully Static Operation: 0 Hz to 24 MHz
- Three-level Program Memory Lock
- 256 x 8-bit Internal RAM
- 32 Programmable I/O Lines
- Three 16-bit Timer/Counters
- Nine Interrupt Sources
- Programmable UART Serial Channel
- SPI Serial Interface
- Low-power Idle and Power-down Modes
- Interrupt Recovery From Power-down
- Programmable Watchdog Timer
- Dual Data Pointer
- Power-off Flag
一般应用: 4.0X-6.0V 0-70℃
AT89S8252-24AC 44A
AT89S8252-24JC 44J
AT89S8252-24PC 40P6
工业级应用: 4.0X-6.0V -40-85℃
AT89S8252-24AI 44A
AT89S8252-24JI 44A
AT89S8252-24PI 44A
AT89S8252应用技术支持与电子电路设计开发资源下载
- AT89s8252的EEPROM和RAM的访问方法
- AT89S8252 DataSheet.PDF
