30.6

TWI用户界面............................................... ........................................... 284

31通用同步异步收发器

（ USART ） .............................. ................................................. 295

31.1

31.2

31.3

31.4

31.5

31.6

31.7

概观.........................................................................................................295

框图................................................ ................................................. 296

应用框图............................................... ............................... 297

I / O线说明............................................. ......................................... 297

产品相关................................................ .................................... 298

功能说明................................................ ..................................... 299

USART用户界面............................................... ..................................... 330

32同步串行控制器（ SSC ） ........................................... ..... 349

32.1

32.2

32.3

32.4

32.5

32.6

32.7

32.8

概观.........................................................................................................349

框图................................................ ................................................. 350

应用框图............................................... ............................... 350

引脚名称列表..................................................................................................351

产品相关................................................ .................................... 351

功能说明................................................ ..................................... 351

SSC应用实例............................................... ............................... 362

同步串行控制器（ SSC ）用户界面...................................... 364

33定时器/计数器（ TC ） ........................................... ................................... 387

33.1

33.2

33.3

33.4

33.5

33.6

概观.........................................................................................................387

框图................................................ ................................................. 387

引脚名称列表..................................................................................................388

产品相关................................................ .................................... 388

功能说明................................................ ..................................... 389

定时器/计数器（ TC ）用户界面.......................................... ........................ 402

34脉冲宽度调制控制器（ PWM ） ........................................ 421

34.1

34.2

34.3

34.4

34.5

34.6

概观.........................................................................................................421

框图................................................ ................................................. 421

I / O线说明............................................. .......................................... 422

产品相关................................................ .................................... 422

功能说明................................................ ..................................... 423

脉冲宽度调制控制器（ PWM）的用户界面.............................. 431

35 USB设备端口（ UDP ） ........................................... ............................. 441

35.1

vi

描述......................................................................................................441

AT91SAM7XC256 / 128初步

6209B–ATARM–10-Feb-06