SYC8
P1228
12.6.8 模式 7：SPI 模式，时钟在空闲模式高电平，数据下降沿触发....................44
12.7 参考例程................................................................44
13 同步串口（SPI）...............................................................46
13.1 简介...................................................................46
13.2 主要特性................................................................46
13.3 SPI 相关寄存器...........................................................46
13.3.1 控制寄存器 SPIx....................................................46
13.3.2 模式选择..........................................................47
13.4 功能描述................................................................47
13.4.1 SPI 主模式........................................................47
13.4.2 IIC 主模式........................................................51
14 实时时钟（RTC）...............................................................55
14.1 简介...................................................................55
14.2 主要特性................................................................55
14.3 功能描述................................................................55
14.4 RTC 相关寄存器...........................................................55
14.4.1 控制寄存器 RTCON...................................................56
14.4.2 计数值寄存器 RTCNT.................................................56
14.4.3 唤醒指针 RTWKP.....................................................56
14.5 参考例程................................................................57
15 低压检测（LVD）...............................................................58
15.1 概述...................................................................58
15.2 相关寄存器..............................................................58
15.3 参考例程................................................................59
16 USB 控制器...................................................................60
16.1 概述...................................................................60
16.2 USB 寄存器..............................................................60
16.3 USB SIE...............................................................61
17 模数转换器 ADC................................................................64
17.1 概述...................................................................64
17.2 ADC 相关寄存器...........................................................65
17.2.1 控制寄存器 ACON....................................................65
17.2.2 结果寄存器 ABUF0...................................................65
17.2.3 结果寄存器 ABUF1...................................................66
17.2.4 ADC 转换时钟频率选择................................................66
17.2.5 ADC 工作模式选择...................................................67
17.3 ADC 配置................................................................67
17.3.1 ADC 工作电压源选择..................................................67
17.3.2 端口配置..........................................................68
17.3.3 ADC 参考电压选择...................................................68
17.3.4 ADC 转换时钟频率...................................................69
17.3.5 ADC 工作模式选择位..................................................69
17.3.6 ADC 转换启动控制位..................................................69
17.4 参考例程................................................................69
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