Enhanced Queued Analog-to-Digital Converter (EQADC)MPC5644A Microcontroller Reference Manual, Rev. 6Freescale Semiconductor 1001Chapter 25Enhanced Queued Analog-to-Digital Converter (EQADC)25.1 Information Specific to This DeviceThis section presents device-specific parameterization and customization information not specificallyreferenced in the remainder of this chapter.25.1.1 Device-Specific Pin Configuration FeaturesThe following eQADC pins are multiplexed and configuration of the corresponding Systems IntegrationUnit (SIU) registers is necessary.25.1.1.1 AN12/MA0/SDSThese pins are configured by setting the Pad Configuration Register 215 (SIU_PCR215) on the SIU.NOTEAttempts to convert the input voltage applied to this pin while the MA0 orthe SDS functions are selected will result in an undefined conversion result.As this pin is also used by digital logic, it has reduced analog to digitalconversion accuracy when compared to the AN[0:11,16:39] analog inputpins.25.1.1.2 AN13/MA1/SDOThese pins are configured by setting the Pad Configuration Register 216 (SIU_PCR216) on the SIU.NOTEAttempts to convert the input voltage applied to this pin while the MA1 orthe SDO functions are selected will result in an undefined conversion result.As this pin is also used by digital logic, it has reduced analog to digitalconversion accuracy when compared to the AN[0:11,16:39] analog inputpins.25.1.1.3 AN14/MA2/SDIThese pins are configured by setting the Pad Configuration Register 217 (SIU_PCR217) on the SIU.NOTEAttempts to convert the input voltage applied to this pin while the MA2 orthe SDI functions are selected will result in an undefined conversion result.As this pin is also used by digital logic, it has reduced analog to digitalconversion accuracy when compared to the AN[0:11,16:39] analog inputpins.
