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8.7128 kHz内部振荡器.............................................. ........................................ 33
8.8External时钟.........................................................................................................34
8.9Clock输出缓冲器.............................................. .................................................. 0.34
8.10Timer /计数器振荡器............................................. ........................................... 35
8.11System时钟预分频器.............................................. .......................................... 35
8.12Register说明............................................... ............................................... 36
9
电源管理及睡眠模式............................................. .... 38
9.1Sleep模式............................................................................................................38
9.2Idle模式.................................................................................................................38
减少9.3ADC噪声抑制模式............................................. ....................................... 39
9.4Power向下模式...................................................................................................39
9.5Power保存模式....................................................................................................39
9.6Standby模式.........................................................................................................40
9.7Power减少注册.............................................. ......................................... 40
9.8Minimizing功耗.............................................. ................................ 40
9.9Register说明............................................... ................................................. 42
10系统控制和复位............................................. ....................... 44
10.1Resetting的AVR .............................................. .................................................. 0.44
10.2Reset来源.......................................................................................................44
10.3Power复位.....................................................................................................45
10.4External复位.......................................................................................................46
10.5Brown出检测............................................. ................................................. 46
10.6Watchdog系统复位.............................................. ......................................... 47
10.7Internal参考电压.............................................. ...................................... 47
10.8Watchdog定时器....................................................................................................48
10.9Register说明............................................... ............................................... 52
11中断................................................ ................................................ 55
11.1Overview ................................................................................................................55
11.2Interrupt载体在ATmega48中............................................. ................................. 55
11.3Interrupt向量的ATmega88的............................................. ................................. 57
11.4Interrupt载体中的ATmega168 ............................................. ............................... 60
11.5Register说明............................................... ............................................... 63
12外部中断............................................... .................................. 65
12.1Pin变化中断时序............................................. ..................................... 65
12.2Register说明............................................... ............................................... 66
ii
ATmega48/88/168
2545S–AVR–07/10
