飞思卡尔HC12系类AD转换模块讲解.pdf

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1、FreescaleHCS12微控制器TMFreescaleSemiconductorConfidentialandProprietaryInformation.Freescale™andtheFreescalelogoaretrademarksofFreescaleSemiconductor,Inc.Allotherproductorservicenamesarethepropertyoftheirrespectiveowners.©FreescaleSemiconductor,Inc.2005.A/D转换模块ATDATD1

2、2K256K10SCISCISRAMFLASEEPROM11InternalBusSPI2SPI1BKPINTMMIPWMoror8PWMPWMSPI0CHANCHCHStar12CPUSIM4-70-3CMBDMMEBIPIMPLLPITBDLCECT4KmsCANmsCANmsCANmsCANorBYTES84321msCANEEPROMCHANor0IICSlide1TMFreescaleSemiconductorConfidentialandProprietaryInformation.Freescale™andth

3、eFreescalelogoaretrademarksofFreescaleSemiconductor,Inc.Allotherproductorservicenamesarethepropertyoftheirrespectiveowners.©FreescaleSemiconductor,Inc.2005.AD转换模块特点：：：8/10位精度•7us,10-位单次转换时间.•采样缓冲放大器•可编程采样时间•左左左/右右右对齐右对齐,有符号/无符号结果数据•外部触发控制•转换完成中断•模拟输入8通道复用•模拟/数字输入引脚

4、复用•1到到到8转换序列长度•连续转换模式•多通道扫描方式Slide2TMFreescaleSemiconductorConfidentialandProprietaryInformation.Freescale™andtheFreescalelogoaretrademarksofFreescaleSemiconductor,Inc.Allotherproductorservicenamesarethepropertyoftheirrespectiveowners.©FreescaleSemiconductor,Inc.20

5、05.A/D寄存器控制寄存器状态寄存器转换结果寄存器Slide3TMFreescaleSemiconductorConfidentialandProprietaryInformation.Freescale™andtheFreescalelogoaretrademarksofFreescaleSemiconductor,Inc.Allotherproductorservicenamesarethepropertyoftheirrespectiveowners.©FreescaleSemiconductor,Inc.2005.

6、A/D控制寄存器2ADPU-A/D电源使能/禁止AWAI-A/D等待模式ASCIE-A/D顺序完成中断使能1=A/D模块上电1=等待模式下，转换0=禁止A/D，以减少功耗0=等待模式下，禁止转换ASCIF-A/D顺序完成标志位ATDCTRL2Addressoffset$0002AFFC-A/D快速转换完成标志位清零1=快速标志位清零顺序每次读取结果寄存器自动清零0=正常标志位清零顺序需要手动对状态标志位清零ETRIGLEETRIGPETRIGESCAN描述xx00忽略外部触发，执行一次转换后停止xx01忽略外部触发，执行连续

7、转换后001X下降沿触发，每次触发，执行一次转换011X上升沿触发，每次触发，执行一次转换101X低电平触发，每次触发，执行连续转换111X高电平触发，每次触发，执行连续转换Slide4TMFreescaleSemiconductorConfidentialandProprietaryInformation.Freescale™andtheFreescalelogoaretrademarksofFreescaleSemiconductor,Inc.Allotherproductorservicenamesaretheprop

8、ertyoftheirrespectiveowners.©FreescaleSemiconductor,Inc.2005.A/D控制寄存器3AddressoffsetATDCTRL3$0003FRZResponseFIFO–结果寄存器FIFO1=结果寄存器没有映射到转换序列00Ignore