MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
2-51
the GPIO setting 0b00. Although the SDS signal uses the GPIO setting, there is no GPIO functionality on
this pin. This pin has reduced analog to digital conversion accuracy as compared to the AN[0:7] and
AN[16:39] analog input pins.
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 it
must terminate a data transmission. SDS corresponds to the chip select signal in a conventional SPI
interface.
2.3.9.14
Analog Input / Mux Address 1 / eQADC Serial Data Out
AN[13]_MA[1]_SDO
AN[13]_MA[1]_SDO is an analog input pin. The alternate function, MA[1], is a MUX address pin. SDO
is the serial data output for the eQADC SSI; select this function by setting the PA field of SIU_PCR216 to
the GPIO setting 0b00. Although the SDO signal uses the GPIO setting, there is no GPIO functionality on
this pin. This pin has reduced analog to digital conversion accuracy as compared to the AN[0:7] and
AN[16:39] analog input pins.
2.3.9.15
Analog Input / Mux Address 2 / eQADC Serial Data In
AN[14]_MA[2]_SDI
AN[14]_MA[2]_SDI is an analog input pin. The alternate function, MA[2], is a MUX address pin. SDI is
the serial data input for the eQADC SSI; select this function by setting the PA field of SIU_PCR217 to the
GPIO setting 0b00. Although the SDI signal uses the GPIO setting, there is no GPIO functionality on this
pin. This pin has reduced analog to digital conversion accuracy as compared to the AN[0:7] and AN[16:39]
analog input pins.
2.3.9.16
Analog Input / eQADC Free Running Clock
AN[15]_FCK
AN[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.
2.3.9.17
Analog Input
AN[16:39]
AN[16:39] are analog input pins.
2.3.9.18
External Trigger / GPIO
ETRIG[0:1]_GPIO[111:112]
ETRIG[0:1]_GPIO[111:112] are external trigger input pins for the eQADC.
2.3.9.19
Voltage Reference High
V
RH
V
RH
is the voltage reference high input pin for the eQADC.
Summary of Contents for MPC5553
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