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AT90USB64/128
7
电源管理及睡眠模式............................................. .... 52
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
空闲模式...........................................................................................................53
ADC噪声抑制模式.............................................. ................................ 53
掉电模式.............................................. ............................................... 53
省电模式.............................................. ................................................ 53
待机模式....................................................................................................54
延长待机模式............................................... ..................................... 54
功率降低注册............................................... .................................. 55
降低功耗............................................... .......................... 56
8
系统控制和复位.............................................. ...................... 58
8.1
8.2
内部参考电压............................................... ................................. 63
看门狗定时器................................................ ................................................. 63
9
中断................................................. ............................................... 69
9.1
中断向量AT90USB64 / 128 ............................................ ..................... 69
10个I / O端口............................................ .................................................. .... 73
10.1简介........................................................................................................73
10.2端口作为通用数字I / O .......................................... ..................................... 74
10.3端口的第二功能.............................................. ...................................... 78
10.4寄存器说明的I / O端口......................................... ............................. 91
11外部中断............................................... .................................. 95
12定时器/计数器，定时器/计数器和定时器/计数器预分频器... 99
12.1内部时钟源.............................................. ........................................... 99
12.2预分频器复位............................................... .................................................. 99
12.3外部时钟源.............................................. ......................................... 99
12.4通用定时器/计数器控制寄存器 - GTCCR ........................................ 100
13 8位定时器/计数器与PWM ......................................... ................. 101
13.1概述..........................................................................................................101
13.2定时器/计数器时钟源............................................ .............................. 102
13.3计数器单元.....................................................................................................102
13.4输出比较单元.............................................. ......................................... 103
13.5比较匹配输出单元............................................. ............................... 105
13.6工作模式.............................................. ........................................... 106
13.7定时器/计数器时序图............................................ .......................... 110
13.8 8位定时器/计数器寄存器的说明......................................... ................ 111
2
7593A–AVR–02/06
