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AT32UC3A
21.3Block图.....................................................................................................154
21.4Functional说明............................................... .......................................... 154
21.5User接口......................................................................................................156
22通用输入/输出控制器（ GPIO ） ............................. 170
22.1Features ..............................................................................................................170
22.2Overview ..............................................................................................................170
22.3Product依赖............................................... .......................................... 170
22.4Functional说明............................................... .......................................... 171
22.5General通用输入/输出（ GPIO ）用户界面....................................... ..175
22.6Programming例子............................................... ....................................... 189
23串行外设接口（SPI） ........................................... ............... 191
23.1Features ..............................................................................................................191
23.2Description ...........................................................................................................191
23.3Block图.....................................................................................................192
23.4Application框图.............................................. ..................................... 193
23.5Signal说明............................................... ................................................. 194
23.6Product依赖............................................... ......................................... 195
23.7Functional说明............................................... .......................................... 196
23.8Serial外围设备接口（ SPI）的用户界面......................................... ......... 206
24双线接口（ TWI ） .......................................... ........................... 220
24.1Features ..............................................................................................................220
24.2Overview ..............................................................................................................220
缩写24.3List .............................................. .............................................. 221
24.4Block图.....................................................................................................221
24.5Application框图.............................................. ..................................... 222
24.6I / O线说明............................................ ............................................... 222
24.7Product依赖............................................... ......................................... 222
24.8Functional说明............................................... .......................................... 223
操作24.9Modes .............................................. ............................................... 223
24.10Master模式......................................................................................................224
24.11内部地址使用使用的外设DMA控制器（ PDC ） .............. 228
24.12Multi主模式............................................. ................................................ 235
24.13Slave模式........................................................................................................238
24.14Two线接口（ TWI ）用户界面........................................ ................... 246
25同步串行控制器（ SSC ） ........................................... ..... 259
iv
32058H–AVR32–03/09
