ATmega329/3290/649/6490

目录

产品特点..................................................................................................... 1

1

2

3

引脚配置................................................ ................................... 2

免责声明................................................. ................................................ 3

概述................................................. .................................................. 3

3.1

3.2

3.3

框图................................................ .................................................. 0.4

ATmega329 ， ATmega3290 ， ATmega649和ATmega6490 6的比较

引脚说明................................................ ................................................. 6

4

5

6

7

资源................................................. ................................................ 9

数据保留................................................ .......................................... 9

代码例子............................................... .............................. 9

AVR CPU内核

........................................................................................ 10

7.1

7.2

7.3

7.4

7.5

7.6

7.7

7.8

概观..........................................................................................................10

结构概述................................................ ..................................... 10

ALU - 算术逻辑单元............................................. ................................ 11

AVR状态寄存器............................................... ......................................... 12

通用寄存器文件.............................................. .......................... 13

堆栈指针...................................................................................................14

指令执行时间............................................... ............................ 15

复位和中断处理.............................................. ............................. 15

8

AVR单片机ATmega329 / 3290 /六千四百九十分之六百四十九回忆......................................... 18

8.1

8.2

8.3

8.4

8.5

系统内可编程的Flash程序存储器..................................... 18

SRAM数据存储器............................................... ......................................... 19

EEPROM数据存储器............................................... ................................... 20

I / O存储器......................................................................................................21

注册说明................................................ ........................................ 22

9

系统时钟及时钟选项............................................. ............ 26

9.1

9.2

9.3

9.4

9.5

时钟系统及其分布............................................. .................. 26

时钟源................................................ ................................................. 27

晶体振荡器................................................ ............................................. 28

低频晶体振荡器............................................. ........................ 29

校准的内部RC振荡器.............................................. ....................... 29

i

2552J–AVR–08/07