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17.2数据模式........................................................................................................159
17.3 SPI寄存器说明.............................................. ...................................... 160
18 USART ................................................ .................................................. 。 163
18.1概述............................................................................................................164
18.2时钟发生器............................................... ................................................. 165
18.3帧格式...................................................................................................168
18.4 USART初始化............................................... ............................................ 170
18.5数据传输 - USART发送........................................... ........ 172
18.6数据接收 - USART接收........................................... ................. 175
18.7异步数据接收.............................................. ............................. 180
18.8多处理器通信模式............................................ ................... 183
18.9 USART寄存器说明.............................................. ................................ 185
波特率设置的18.10例子............................................ ........................... 190
19 USI - 通用串行接口............................................ .............. 194
19.1概述............................................................................................................194
19.2功能说明............................................... ....................................... 195
19.3其他USI用法.............................................. .......................................... 201
19.4 USI寄存器说明.............................................. .................................... 202
20交流 - 模拟比较器............................................. ........................ 206
20.1模拟比较器多路输入............................................. ................... 207
20.2模拟比较器寄存器说明............................................. .............. 208
21 ADC - 模数转换器........................................... .......... 210
21.1特点.............................................................................................................210
21.2操作............................................................................................................211
21.3启动转换.............................................. ........................................... 212
21.4预分频和转换时序............................................. ........................ 213
21.5改变通道或基准选择............................................ ............ 215
21.6 ADC噪声抑制器.............................................. ............................................ 216
21.7 ADC转换结果.............................................. ....................................... 221
21.8 ADC寄存器说明.............................................. .................................... 223
22 JTAG接口和片上调试系统..................................... 228
22.1概述............................................................................................................228
22.2 TAP - 测试访问端口............................................ ......................................... 229
22.3 TAP控制器....................................................................................................231
iv
ATmega165(P)
8018A–AVR–03/06
