6.9
6.10
6.11
时钟输出缓冲器............................................... .......................................... 33
定时器/计数器振荡器.............................................. .................................... 33
系统时钟分频器............................................... ................................... 34
7
电源管理及睡眠模式............................................. .... 36
7.1
7.2
7.3
7.4
7.5
7.6
7.7
空闲模式.........................................................................................................37
ADC噪声抑制模式.............................................. .............................. 37
掉电模式.............................................. ............................................. 37
省电模式.............................................. .............................................. 38
待机模式................................................ ................................................. 38
功率降低注册............................................... ................................ 39
降低功耗............................................... ....................... 40
8
系统控制和复位.............................................. ...................... 41
8.1
8.2
内部参考电压............................................... ............................... 46
看门狗定时器................................................ .............................................. 47
9
中断................................................. ............................................... 52
9.1
9.2
9.3
中断向量在ATmega48中.............................................. .......................... 53
中断向量ATmega88的.............................................. .......................... 54
中断向量的ATmega168 .............................................. ........................ 58
10个I / O端口............................................ .................................................. .... 62
10.1
10.2
10.3
10.4
介绍......................................................................................................62
港口作为通用数字I / O ........................................... .................................. 63
端口的第二功能............................................... ................................... 68
注册说明了I / O端口........................................... ......................... 80
11外部中断............................................... .................................. 81
12 8位定时器/计数器与PWM ......................................... ................... 86
12.1
12.2
12.3
12.4
12.5
12.6
12.7
12.8
概观..........................................................................................................86
定时器/计数器时钟源............................................. ............................ 87
计数器单元....................................................................................................87
输出比较单元............................................... ........................................ 88
比较匹配输出单元.............................................. .............................. 90
操作模式............................................... .......................................... 91
定时器/计数器时序图............................................. ........................ 95
8位定时器/计数器寄存器的说明.......................................... .............. 97
334
的ATmega48 / 88/168汽车
7530H–AVR–02/09
