MA803AS2 datasheet(2/75 Pages) MEGAWIN

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QP-7300-03D

2/75

MEGAWIN

MAKE YOU WIN

MA803

1. 概述 ..............................................................................................................5

2. 功能 ..............................................................................................................6

3. 引脚 ..............................................................................................................7

3.1. 封装 .......................................................................................................................................7

3.2. 引脚定义 ................................................................................................................................8

4. 方框图...........................................................................................................9

5. 特殊功能寄存器 SFR ..................................................................................10

5.1. SFR 映射表.........................................................................................................................10

5.2. SFR 位分配.........................................................................................................................11

6. 8051 CPU 功能描述...................................................................................13

6.1. CPU 寄存器 ........................................................................................................................13

6.2. CPU 时序............................................................................................................................14

6.3. CPU 寻址方式.....................................................................................................................14

7. 存储器结构..................................................................................................15

7.1. 片上程序存储器 ...................................................................................................................16

7.2. 片上数据存储器 RAM .........................................................................................................16

7.3. 关于 C51 编译器的声明识别符 ............................................................................................18

8. 双数据指针寄存器 (DPTR).........................................................................19

9. I/O 结构......................................................................................................20

9.1. IO 配置................................................................................................................................20

9.1.1. 准双向口........................................................................................................................20

9.1.2. 推挽输出........................................................................................................................20

9.1.3. 仅输入(高阻输入) ..........................................................................................................21

9.1.4. 开漏集输出 ....................................................................................................................21

9.2. I/O 端口寄存器....................................................................................................................22

9.2.1. 端口 1 ...........................................................................................................................23

9.2.2. 端口 2 ...........................................................................................................................23

9.2.3. 端口 3 ...........................................................................................................................23

10. 中断 ............................................................................................................25

10.1.中断结构 ..............................................................................................................................25

10.2.中断寄存器 ..........................................................................................................................26

11. 定时器/计数器 .............................................................................................29

11.1.定时器 0 和定时器 1............................................................................................................29

11.1.1. 模式 0 ...........................................................................................................................29

11.1.2. 模式 1............................................................................................................................30

11.1.3. 模式 2............................................................................................................................30

11.1.4. 模式 3............................................................................................................................31

11.1.5. 定时器 0/1 寄存器..........................................................................................................32

12. 串行口 (UART)...........................................................................................34

12.1.帧错误检测 ..........................................................................................................................34

12.2.多处理器通讯.......................................................................................................................35

12.3.自动地址识别.......................................................................................................................35

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