CMS69P22 datasheet(2/128 Pages) ETC1

2 / 128 page

中微股份

CMS69P22

www.mcu.com.cn

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内部试用版

产品概述................................................................................................................................................ 1

1.1

功能特性 ...................................................................................................................................................................... 1

1.2

系统结构框图............................................................................................................................................................... 2

1.3

管脚分布 ...................................................................................................................................................................... 3

1.4

管脚描述 ...................................................................................................................................................................... 4

1.5

烧写选择项系统配置寄存器 ..................................................................................................................................... 5

中央处理器(CPU)................................................................................................................................. 6

2.1

存储器 .......................................................................................................................................................................... 6

2.1.1

程序存储器 .............................................................................................................................................................. 6

2.1.2

数据存储器 ............................................................................................................................................................ 11

2.2

寻址模式 .................................................................................................................................................................... 14

2.2.1

直接寻址 ................................................................................................................................................................ 14

2.2.2

立即寻址 ................................................................................................................................................................ 14

2.2.3

间接寻址 ................................................................................................................................................................ 14

2.3

堆栈 ............................................................................................................................................................................ 15

2.4

工作寄存器（ACC） ................................................................................................................................................ 15

2.4.1

概述 ........................................................................................................................................................................ 15

2.4.2

ACC 应用 ............................................................................................................................................................... 15

2.5

程序状态寄存器(FLAGS) ......................................................................................................................................... 16

2.6

预分频器(OPTION) ................................................................................................................................................... 18

2.7

程序计数器（PC）.................................................................................................................................................... 19

2.8

看门狗计数器(WDT)................................................................................................................................................. 19

2.8.1

WDT 周期 .............................................................................................................................................................. 19

系统时钟.............................................................................................................................................. 20

3.1

概述 ............................................................................................................................................................................ 20

3.2

系统振荡器................................................................................................................................................................. 21

3.2.1

EXTRC:外部 RC 振荡 ........................................................................................................................................... 21

3.2.2

XT:外部晶体振荡 .................................................................................................................................................. 22

3.2.3

INTRC:内部 RC 振荡 ............................................................................................................................................ 22

3.2.4

外部振荡 ................................................................................................................................................................ 23

3.3

起振时间 .................................................................................................................................................................... 23

复位...................................................................................................................................................... 24

4.1

上电复位 .................................................................................................................................................................... 24

4.2

掉电复位 .................................................................................................................................................................... 25

4.2.1

掉电复位概述 ........................................................................................................................................................ 25

4.2.2

掉电复位的改进办法 ............................................................................................................................................ 26

4.3

看门狗复位................................................................................................................................................................. 26

4.4

复位口电平复位......................................................................................................................................................... 27

4.5

基本外部复位电路..................................................................................................................................................... 27

4.5.1

RC 复位电路 .......................................................................................................................................................... 27

4.5.2

二极管及 RC 复位电路 ......................................................................................................................................... 28

4.5.3

三极管复位电路 .................................................................................................................................................... 28

4.5.4

稳压二极管复位电路 ............................................................................................................................................ 29

系统工作模式...................................................................................................................................... 30

5.1

休眠模式 .................................................................................................................................................................... 30

5.1.1

休眠模式应用举例 ................................................................................................................................................ 30

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