Freescale单片机原理及应用FreescaleHCS08单片机SPI编程应用Copyright©YangMing.2011.ElectronicsandInformationEngineeringDepartmentofHuazhongUniversityofScienceandTechnologyWuhan,Hubei430074,P.R.ChinaFreescaleHCS08单片机SPI编程应用••ContentsContentsandandObjectivesObjectives:.理解HCS08的SPI模块原理SPI总线信号SPI总线时序SPI模块结构及功能.学会SPI模块设计SPI模块寄存器功能利用SPI模块的串-并转换设计.进一步认识“对MCU外部管脚/内部模块的控制正是通过Regs的控制来实现”Slide1Copyright©YangMing.2011.ElectronicsandInformationEngineeringDepartmentofHuazhongUniversityofScienceandTechnologyWuhan,Hubei430074,P.R.China10.1概述•概况.MC9S08AW60系列MCU内部具有一个SPI模块，SPI的4个功能管脚SPSCK1、MOSI1、MISO1、SS1分别和端口E的PTE7、PTE6、PTE5、PTE4管脚复用•管脚描述.SPSCK.SPI串行时钟.MOSI.主设备数据输出、从设备数据输入.MISO.主设备数据输入、从设备数据输出.SS1.从设备选择Slide2Copyright©YangMing.2011.ElectronicsandInformationEngineeringDepartmentofHuazhongUniversityofScienceandTechnologyWuhan,Hubei430074,P.R.China10.2SPI总线信号和时序•SPI总线信号.SPI，英文全称为SerialPeripheralInterface，串行外围设备接口的意思，是Motorola公司开发的一种全双工同步串行总线。目前有很多外围芯片，例如存储器、A/D或D/A变换器，LCD等均采用SPI接口。SPI使用4个信号来收发数据。Slide3Copyright©YangMing.2011.ElectronicsandInformationEngineeringDepartmentofHuazhongUniversityofScienceandTechnologyWuhan,Hubei430074,P.R.China10.2SPI总线信号和时序•SPI总线时序Slide4Copyright©YangMing.2011.ElectronicsandInformationEngineeringDepartmentofHuazhongUniversityofScienceandTechnologyWuhan,Hubei430074,P.R.China10.2SPI总线信号和时序•SPI总线时序Slide5Copyright©YangMing.2011.ElectronicsandInformationEngineeringDepartmentofHuazhongUniversityofScienceandTechnologyWuhan,Hubei430074,P.R.China10.3功能描述•内部结构Slide6Copyright©YangMing.2011.ElectronicsandInformationEngineeringDepartmentofHuazhongUniversityofScienceandTechnologyWuhan,Hubei430074,P.R.China10.3功能描述•SPI波特率生成Slide7Copyright©YangMing.2011.ElectronicsandInformationEngineeringDepartmentofHuazhongUniversityofScienceandTechnologyWuhan,Hubei430074,P.R.China10.4内部寄存器•SPI波特率寄存器（SPI1BR）Slide8Copyright©YangMing.2011.ElectronicsandInformationEngineeringDepartmentofHuazhongUni