ATmega48/88/168

目录

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

1

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

1.1Pin描述.........................................................................................................3

2

概述................................................. ..................................................五

2.1Block图...........................................................................................................5

之间的ATmega48 ， ATmega88的，与ATmega168 ............................. 6 2.2Comparison

3

4

5

6

资源................................................. ................................................ 7

数据保留................................................ .......................................... 7

代码例子............................................... .............................. 7

AVR CPU内核

.......................................................................................... 8

6.1Overview ....................................................................................................................8

6.2Architectural概述............................................... ................................................ 8

6.3ALU - 算术逻辑单元............................................ ........................................... 9

6.4Status注册........................................................................................................10

6.5General通用寄存器文件............................................. ................................... 11

6.6Stack指针...........................................................................................................12

6.7Instruction执行时序.............................................. ..................................... 13

6.8Reset和中断处理............................................. ...................................... 14

7

AVR回忆................................................ ........................................ 16

7.1Overview ..................................................................................................................16

7.2In系统内可编程闪存程序存储器.......................................... ... 16

7.3SRAM数据存储器.............................................. .................................................. 18

7.4EEPROM数据存储器.............................................. ............................................ 19

7.5I / O存储器..............................................................................................................20

7.6Register说明............................................... ................................................. 21

8

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

8.1Clock系统及其分布............................................ ........................... 26

8.2Clock来源.........................................................................................................27

8.3Low电晶体振荡器............................................. ...................................... 28

8.4Full振幅晶振............................................. ....................................... 30

8.5Low频率晶体振荡器............................................. ............................... 32

8.6Calibrated内部RC振荡器............................................. ................................ 32

i

2545R–AVR–07/09