Atmel AT89C51: 8-Bit Microcontroller with 4KB Flash & 128B RAM -...
4星 · 超过85%的资源 需积分: 26 86 浏览量
更新于2023-03-16
4
收藏 1.29MB DOC 举报 89C51单片机是一篇关于一种高性能、低功耗的8位CMOS微控制器的英文文献翻译。该微处理器由Atmel公司采用高密度非易失性内存技术制造，与工业标准MCS-51指令集和引脚布局兼容。它集成了一个功能强大的8位中央处理器（CPU）和一个单芯片上的闪存，使得Atmel AT89C51成为嵌入式控制应用中极具灵活性和成本效益的选择。
该芯片的主要特性包括：
1. 兼容性：与MCS-51系列产品无缝对接，便于软件移植和升级。
2. 存储容量：内含4KB的可系统编程闪存，支持程序的在线修改和擦除，具有1000次写入/擦除循环的耐用性。
3. 工作模式：支持全静态操作，工作频率范围宽广，从0赫兹到24兆赫兹。
4. 程序存储管理：具有三级程序存储器锁定功能，保护核心代码免受意外修改。
5. 内部RAM：配备128个8位内置随机存取存储器，满足数据暂存和处理需求。
6. I/O线：32条可编程I/O线，增强了外部设备的连接能力。
7. 定时器/计数器：包含两个16位的定时器/计数器，支持精确的时间测量和脉冲计数。
8. 中断系统：提供六个中断源，支持多任务处理和实时响应。
9. 串行通信：具备可编程的串行通道，支持全双工通信，有利于与外部设备的数据交换。
10. 低功耗模式：提供低功耗空闲模式和电源关闭模式，延长电池寿命在能源受限的应用中尤为关键。
Atmel AT89C51单片机凭借其卓越的性能、广泛的兼容性和丰富的功能集，成为工业控制和嵌入式系统设计中的热门选择。对于研究者和工程师来说，深入理解并掌握这种单片机的原理和应用，有助于他们在实际项目中提高效率和创新力。通过这篇英文文献的翻译，读者可以更全面地了解这款微处理器的技术细节和潜在用途。
(031H)=51H
(032H)=FFH
(031H)=51H
(032H)=05H
The AT89C51 code memory array is programmed byte-bybyte in either programming mode. To
program any nonblank byte in the on-chip Flash Programmable and Erasable Read Only Memory, the
entire memory must be erased using the Chip Erase Mode.
Programming Algorithm:
Before programming the AT89C51, the address, data and control signals should be set up
according to the Flash programming mode table and Figures 3 and 4. To program the AT89C51, take
the following steps.
1. Input the desired memory location on the address lines.
2. Input the appropriate data byte on the data lines.
3. Activate the correct combination of control signals.
4. Raise EA/VPP to 12V for the high-voltage programming mode.
5. Pulse ALE/PROG once to program a byte in the Flash array or the lock bits. The byte-write
cycle is self-timed and typically takes no more than 1.5 ms. Repeat steps 1 through 5, changing the
address and data for the entire array or until the end of the object file is reached.
Data Polling: The AT89C51 features Data Polling to indicate the end of a write cycle. During a
write cycle, an attempted read of the last byte written will result in the complement of the written datum
on PO.7. Once the write cycle has been completed, true data are valid on all outputs, and the next cycle
may begin. Data Polling may begin any time after a write cycle has been initiated.
Ready/Busy: The progress of byte programming can also be monitored by the RDY/BSY output
signal. P3.4 is pulled low after ALE goes high during programming to indicate BUSY. P3.4 is pulled
high again when programming is done to indicate READY.
Program Verify: If lock bits LB1 and LB2 have not been programmed, the programmed code data
can be read back via the address and data lines for verification. The lock bits cannot be verified directly.
Verification of the lock bits is achieved by observing that their features are enabled.
Chip Erase: The entire Flash Programmable and Erasable Read Only Memory array is erased
electrically by using the proper combination of control signals and by holding ALE/PROG low for 10
ms. The code array is written with all “1”s. The chip erase operation must be executed before the code
memory can be re-programmed.
Reading the Signature Bytes: The signature bytes are read by the same procedure as a normal
verification of locations 030H, 031H, and 032H, except that P3.6 and P3.7 must be pulled to a logic
low. The values returned are as follows.
(030H) = 1EH indicates manufactured by Atmel
(031H) = 51H indicates 89C51
(032H) = FFH indicates 12V programming
(032H) = 05H indicates 5V programming
Programming Interface
Every code byte in the Flash array can be written and the entire array can be erased by using the
appropriate combination of control signals. The write operation cycle is selftimed and once initiated,
will automatically time itself to completion. Program Memory Lock Bits
剩余30页未读，继续阅读
1285 浏览量
2022-07-14 上传
2023-06-29 上传
811 浏览量
730 浏览量
108 浏览量
136 浏览量
Haoyiding
- 粉丝: 0
- 资源: 6
我的内容管理
展开
最新资源
- ST7537电力线调制解调方案
- TCP/IP Sockets In C#
- 08年信息系统管理工程师下午试题
- (电子书)工作流管理联盟规范（接口）
- GSM MODEM/GSM 终端编程开发 PDU 码/短信格式短信规则解析
- 短信开发之PDU格式详解.pdf
- QtEmbedded实例教程.pdf
- AVR单片机驱动128*64LCD显示的示例程序(KS0108芯片)
- Java数据库连接池简单实例
- 园区网互联与网站建设试题
- K／3动态密码系统操作手册20071221.pdf
- (完全)进销存系统开发论文
- 实现模式（英文版）pdf
- Delphi高手突破（官方版）.pdf
- Kingdee Way实施方法论介绍PPT
- LAMP（linux+apache+mysql+php）的基本配置
