AT89S54单片机解密

AT89S54特点
•80C52完全兼容
- 8051指令兼容
- 6个8位I / O端口（64针或68引脚版本）
- 4个8位I / O端口（引脚44版）
- 3个16位定时器/计数器
- 256字节便签RAM
- 9个中断源，4个优先级
•集成的电源监控（葡萄牙/ PFD的）监督内部电源（AT89S64
只有）
•ISP（在系统编程）使用标准VCC电源
•2048字节的引导ROM包含低级别闪存编程程序和默认
串行装载机
•高速架构
- 在标准模式：
40兆赫（2.7V至5.5V的VCC，内部和外部代码执行）
60兆赫（4.5V至5.5V的VCC和内部代码只）
- 在X2方式（6时钟/机器周期）
20兆赫（2.7V至5.5V的VCC，内部和外部代码执行）
30兆赫（4.5V至5.5V的VCC和内部代码只）
•16K/32K/64K字节片上闪存程序/数据存储器
- 字节和页（128字节）的擦除和写入
- 100K的写周期
•片上1792字节扩展RAM（内XRAM）为AT89S64，768 AT89S54/58字节
- 软件可选择尺寸（0，256，512，768，1024，1792字节）
- 768字节选定复位AT89S64
- 256字节选定复位AT89S54/58
•双数据指针
•变慢速内存/外设长度的MOVX
•改进x2模式具有自主CPU和每个外设的选择
•8位预分频器的时钟
•16位可编程计数器阵列
- 高速输出
- 比较/捕获
- 脉宽调制器
- 看门狗定时器功能
•异步端口复位
•全双工加强与专用的内部UART的波特率发生器
•（禁止啤酒）低EMI
•硬件看门狗定时器（一次性使用复位输出启用），断电标志
•电源控制模式：空闲模式，掉电模式
•单电源范围：2.7V至5.5V
•工业级温度范围（-40至+85 ° C）
•封装：PLCC44脚，PDIL40

AT89S54 Features
• 80C52 Compatible
– 8051 Instruction Compatible
– Six 8-bit I/O Ports (64 Pins or 68 Pins Versions)
– Four 8-bit I/O Ports (44 Pins Version)
– Three 16-bit Timer/Counters
– 256 Bytes Scratch Pad RAM
– 9 Interrupt Sources with 4 Priority Levels
• Integrated Power Monitor (POR/PFD) to Supervise Internal Power Supply (AT89S64
Only)
• ISP (In-System Programming) Using Standard VCC Power Supply
• 2048 Bytes Boot ROM Contains Low Level Flash Programming Routines and a Default
Serial Loader
• High-speed Architecture
– In Standard Mode:
40 MHz (Vcc 2.7V to 5.5V, both Internal and external code execution)
60 MHz (Vcc 4.5V to 5.5V and Internal Code execution only)
– In X2 mode (6 Clocks/machine cycle)
20 MHz (Vcc 2.7V to 5.5V, both Internal and external code execution)
30 MHz (Vcc 4.5V to 5.5V and Internal Code execution only)
• 16K/32K/64K Bytes On-chip Flash Program/Data Memory
– Byte and Page (128 Bytes) Erase and Write
– 100k Write Cycles
• On-chip 1792 bytes Expanded RAM (XRAM) for AT89S64, 768 Bytes for AT89S54/58
– Software Selectable Size (0, 256, 512, 768, 1024, 1792 Bytes)
– 768 Bytes Selected at Reset for AT89S64
– 256 Bytes Selected at Reset for AT89S54/58
• Dual Data Pointer
• Variable Length MOVX for Slow RAM/Peripherals
• Improved X2 Mode with Independent Selection for CPU and Each Peripheral
• 8-bit Clock Prescaler
• 16-bit Programmable Counter Array
– High Speed Output
– Compare/Capture
– Pulse Width Modulator
– Watchdog Timer Capabilities
• Asynchronous Port Reset
• Full-duplex Enhanced UART with Dedicated Internal Baud Rate Generator
• Low EMI (Inhibit ALE)
• Hardware Watchdog Timer (One-time Enabled with Reset-Out), Power-off Flag
• Power Control Modes: Idle Mode, Power-down Mode
• Single Range Power Supply: 2.7V to 5.5V
• Industrial Temperature Range (-40 to +85°C)
• Packages: PLCC44, PDIL40
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