11.2.1 SCI 波特率寄存器（SCIxBDH、SCIxBDL）...................................................168
11.2.2 SCI 控制寄存器1 （SCIxC1）..........................................................................169
11.2.3 SCI 控制寄存器2 （SCIxC2）..........................................................................170
11.2.4 SCI 状态寄存器1 （SCIxS1）...........................................................................171
11.2.5 SCI 状态寄存器2 （SCIxS2）...........................................................................172
11.2.6 SCI 控制寄存器3 （SCIxC3）..........................................................................173
11.2.7 SCI 数据寄存器（SCIxD）...............................................................................174
11.3 功能描述 ........................................................................................................................174
11.3.1 波特率产生 ........................................................................................................175
11.3.2 发送功能描述 ....................................................................................................175
11.3.3 接收功能描述 ....................................................................................................176
11.3.4 中断和状态标志.................................................................................................177
11.3.5 其他SCI 功能....................................................................................................178
第12 章串行外设接口（S08SPIV3）
12.1 简介 ...............................................................................................................................181
12.1.1 特征...................................................................................................................183
12.1.2 框图...................................................................................................................183
12.1.3 SPI 波特率发生器 .............................................................................................185
12.2 外部信号描述 .................................................................................................................185
12.2.1 SPSCK —SPI 串行时钟 ...................................................................................185
12.2.2 MOSI —主出从入引脚 .....................................................................................185
12.2.3 MISO —主入从出引脚 .....................................................................................185
12.2.4 SS —从机选择引脚 ..........................................................................................185
12.3 操作模式 ........................................................................................................................186
12.3.1 停止模式中的SPI .............................................................................................186
12.4 寄存器定义 .....................................................................................................................186
12.4.1 SPI 控制寄存器1 （SPIC1）.............................................................................186
12.4.2 SPI 控制寄存器2 （SPIC2）.............................................................................187
12.4.3 SPI 比特率寄存器（SPIBR）...........................................................................188
12.4.4 SPI 状态寄存器（SPIS）..................................................................................189
12.4.5 SPI 数据寄存器（SPID）.................................................................................190
12.5 功能性描述 .....................................................................................................................190
12.5.1 SPI 时钟格式 .....................................................................................................191
12.5.2 SPI 中断 ............................................................................................................193
12.5.3 模式故障检测 ....................................................................................................193
第13 章IIC 总线（S08IICV2）
13.1 简介 ...............................................................................................................................195
13.1.1 特征...................................................................................................................197
13.1.2 操作模式 ...........................................................................................................197
13.1.3 框图...................................................................................................................197
13.2 外部信号描述 .................................................................................................................198
13.2.1 SCL—串行时钟线 .............................................................................................198
13.2.2 SDA—串行数据线 .............................................................................................198
MC9S08AC16 系列微控制器数据手册, 第6 版
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