Signal DescriptionMPC5566 Microcontroller Reference Manual, Rev. 22-32 Freescale Semiconductor2.3.8.13 Analog Input / Mux Address 0 / eQADC Serial Data StrobeAN[12]_MA[0]_SDSAN[12]_MA[0]_SDS is an analog input pin. The alternate function, MA[0], is a MUX address pin. SDSis the serial data strobe for the eQADC SSI; this function is selected by setting the PA field ofSIU_PCR215 to GPIO. This pin has reduced analog to digital conversion accuracy as compared to theAN[0:7] and AN[16:39] analog input pins because they are powered by V DDEH9 and can be used as digitalpins for the synchronous serial interface (SSI) to external ADCs or used as the multiplexor digital outputs(MA[0]).SDS is the serial data select output that is muxed with AN[12] and MA[0]. It indicates to the external(slave) device when it can latch incoming serial data, when it can output its own serial data, and when itmust abort a data transmission. SDS corresponds to the chip select signal in a conventional SPI interface.This pin is configured by setting the pad configuration register, SIU_PCR215.2.3.8.14 Analog Input / Mux Address 1 / eQADC Serial Data OutAN[13]_MA[1]_SDOAN[13]_MA[1]_SDO is an analog input pin. The alternate function, MA[1], is a MUX address pin. SDOis the serial data output for the eQADC SSI; this function is selected by setting the PA field ofSIU_PCR216 to GPIO. This pin has reduced analog to digital conversion accuracy as compared to theAN[0:7] and AN[16:39] analog input pins because they are powered by V DDEH9 and can be used as digitalpins for the synchronous serial interface (SSI) to external ADCs or used as the multiplexor digital outputs(MA[1]).This pin is configured by setting the pad configuration register, SIU_PCR216.2.3.8.15 Analog Input / Mux Address 2 / eQADC Serial Data InAN[14]_MA[2]_SDIAN[14]_MA[2]_SDI is an analog input pin. The alternate function, MA[2], is a MUX address pin. SDI isthe serial data input for the eQADC SSI; this function is selected by setting the PA field of SIU_PCR217to GPIO. This pin has reduced analog to digital conversion accuracy as compared to the AN[0:7] andAN[16:39] analog input pins because they are powered by V DDEH9 and can be used as digital pins for thesynchronous serial interface (SSI) to external ADCs or used as the multiplexor digital outputs (MA[2]).This pin is configured by setting the pad configuration register, SIU_PCR217.2.3.8.16 Analog Input / eQADC Free Running ClockAN[15]_FCKAN[15]_FCK is an analog input pin. The alternate function is the free running clock for the eQADC SSI.This pin has reduced analog to digital conversion accuracy as compared to the AN[0:7] and AN[16:39]analog input pins.This pin is configured by setting the pad configuration register, SIU_PCR218.
