Analog-to-Digital ConverterA/D Conversion TimingPanasonic Semiconductor Development Company MN102H75K/F75K/85K/F85K LSI User Manual146Panasonic6.4.4 Single Channel/Continuous Conversion TimingWhen ANMD[1:0] = b’10’, the ADC converts one ADIN input signal contin-uously. An interrupt occurs each time the conversion ends. Load the number ofthe channel to be converted in the AN1CH[3:0] field of the ADC control register(ANCTR). (The ANNCH[3:0] field is ignored in this mode.)When the software starts the conversion, write a 0 to the ANTC bit (disablingconversion start at timer 1 underflow), then write a 1 to ANEN. (If ANTC = 1,ANEN goes high upon a timer 1 underflow.) ANEN remains high during the con-version. To end the A/D conversion, write a 0 to ANEN.6.4.5 Multiple Channel/Continuous Conversion TimingWhen ANMD[1:0] = b’11’, the ADC converts multiple, consecutive ADIN inputsignals continuously. An interrupt occurs each time the conversion sequenceends. Load 0s to the AN1CH[3:0] field of the ADC control register (ANCTR),then load the number of the final channel in the sequence to the ANNCH[3:0]field. The sequence always begins with channel 0.When the software starts the conversion, write a 0 to the ANTC bit (disablingconversion start at timer 1 underflow), then write a 1 to ANEN. (If ANTC = 1,ANEN goes high upon a timer 1 underflow.) ANEN remains high during the con-version. To end the A/D conversion, write a 0 to ANEN. Note that theAN1CH[3:0] field holds the number of the channel being converted. It clears to 0when the sequence ends.Figure 6-6 Single Channel/Continuous Conversion TimingFigure 6-7 Multiple Channel/Continuous Conversion TimingStopStartInterruptrequestsANENState Channel nconversionChannel nconversionChannel nconversionChannel nconversionChannel nconversionChannel 0conversionChannel 1conversionChannel 2conversionChannel 0conversionChannel 0conversionChannel 1conversionChannel 2conversionStopStartInterruptrequestsANENState
