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3. 系统管理器件
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   低功耗复位器
4. Interface 接口器件
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5. 数据转换器
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6. 电源管理器件
   标准线性电源
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   电压基准
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   电源模块与功率器件
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7. 时钟管理 定时器 计数器
8. 数字电位器 DCP
9. 开关器件
10. 传感器
11. 可编程逻辑器件
    FPGA 现场可编程逻辑
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12. 逻辑电路
13. 其他

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.

• AT89S8252 兼容MCS—51指令系统
• AT89S8252 8k可反复擦写(>1000次）Flash ROM
• AT89S8252 32个双向I/O口
• AT89S8252 256x8bit内部RAM
• AT89S8252 3个16位可编程定时/计数器中断
• AT89S8252 全静态操作0-24MHz
• AT89S8252 SPI串行口
• AT89S8252 4.0-6.0V工作电压范围
• AT89S8252 2个外部中断源
• AT89S8252 可编程UART串行通道
• AT89S8252 2个读写中断口线
• AT89S8252 3级加密位
• AT89S8252 低功耗空闲和掉电功能
• AT89S8252 两种软件设置睡眠和唤醒功能
• AT89S8252 Compatible with MCS-51TM Products ·
• AT89S8252 8K Bytes of In-System Reprogrammable Downloadable Flash Memory
  ­ SPI Serial Interface for Program Downloading
  ­ Endurance: 1,000 Write/Erase Cycles
• AT89S8252 2K Bytes EEPROM
  ­ Endurance: 100,000 Write/Erase Cycles
• AT89S8252 4V to 6V Operating Range
• AT89S8252 Fully Static Operation: 0 Hz to 24 MHz
• AT89S8252 Three-level Program Memory Lock
• AT89S8252 256 x 8-bit Internal RAM
• AT89S8252 32 Programmable I/O Lines
• AT89S8252 Three 16-bit Timer/Counters
• AT89S8252 Nine Interrupt Sources
• AT89S8252 Programmable UART Serial Channel
• AT89S8252 SPI Serial Interface
• AT89S8252 Low-power Idle and Power-down Modes
• AT89S8252 Interrupt Recovery From Power-down
• AT89S8252 Programmable Watchdog Timer
• AT89S8252 Dual Data Pointer
• AT89S8252 Power-off Flag

AT89S8252技术支持:

• AT89s8252的EEPROM和RAM的访问方法
• AT89S8252 DataSheet.PDF