待机Mode..................................................................................................... 37
功率降低注册............................................... ................................... 37
降低功耗............................................... .......................... 38
系统控制和复位.............................................. .................. 40
内部参考电压............................................... .................................. 45
看门狗定时器................................................ ................................................. 46
中断................................................. ........................................... 51
中断向量在ATmega48中.............................................. ............................. 51
中断向量ATmega88的.............................................. ............................. 53
中断向量的ATmega168 .............................................. ........................... 57
I/O-Ports.............................................................................................. 62
介绍.........................................................................................................
港口作为通用数字I / O ........................................... .....................................
端口的第二功能............................................... ......................................
注册说明了I / O端口........................................... ............................
62
63
67
79
外部中断................................................ ............................. 80
8位定时器/计数器与PWM .......................................... .............. 85
Overview.............................................................................................................
定时器/计数器时钟源............................................. ................................
计数器Unit........................................................................................................
输出比较单元............................................... ...........................................
比较匹配输出单元.............................................. .................................
操作模式............................................... .............................................
定时器/计数器时序图............................................. ............................
8位定时器/计数器寄存器的说明.......................................... .................
85
86
86
87
89
90
94
95
T / C0与T / C1的预分频器.......................... 102
16位定时器/计数器与PWM .......................................... .......... 104
Overview...........................................................................................................
访问16位寄存器............................................. ..................................
定时器/计数器时钟源............................................. ..............................
计数器Unit......................................................................................................
输入捕捉单元............................................... ..............................................
输出比较单元............................................... .......................................
比较匹配输出单元.............................................. ...............................
操作模式............................................... ...........................................
定时器/计数器时序图............................................. ..........................
16位定时器/计数器寄存器的说明.......................................... .............
104
106
110
110
111
113
114
115
123
125
8位定时器/计数器，具有PWM和异步操作.. 132
ii
ATmega48/88/168
2545D–AVR–07/04
