System Interface Unit (SIU)
MPC5553/MPC5554 Microcontroller Reference Manual,
Rev. 5
6-108
Freescale Semiconductor
Figure 6-142. Four-to-One Internal Multiplexing Block Diagram
6.4.5.1
eQADC External Trigger Input Multiplexing
The six eQADC external trigger inputs can be connected to an external pin, an eTPU channel, or an eMIOS
channel. The input source for each eQADC external trigger is individually specified in the eQADC trigger
input select register (SIU_ETISR). An example of the multiplexing of an eQADC external trigger input is
given in
. As shown in the figure, the ETRIG[0] input of the eQADC can be connected to
either the ETRIG[0]_GPIO[111] pin, the ETPUA[30] channel, the EMIOS[10] channel, or the GPIO[206]
pin. The remaining ETRIG inputs are multiplexed in the same manner (see
Trigger Input Select Register (SIU_ETISR)
for the SIU_ETISR[TSEL0]–SIU_ETISR[TSEL5] bit
definitions). If an ETRIG input is connected to an eTPU or eMIOS channel, the external pin used by that
channel can be used by the alternate function on that pin.
Figure 6-143. eQADC External Trigger Input Multiplexing
6.4.5.2
SIU External Interrupt Input Multiplexing
The 16 SIU external interrupt inputs can be connected to either an external pin or to serialized output
signals from a DSPI module. The input source for each SIU external interrupt is individually specified in
the external IRQ input select register (SIU_EIISR). An example of the multiplexing of an SIU external
interrupt input is given in
. As shown in the figure, the IRQ[0] input of the SIU can be
connected to either the IRQ[0]_GPIO[203] pin, the DSPI B[0] serial input signal, the DSPI C[1]
SIU_ETISR, SIU_EIISR, & SIU_DISR
To chip-level signal
external to the SIU
From chip-level signals
external to the SIU
SIU
SIU_ETISR[TSEL0]
ETRIG[0]
GPIO[206]
ETRIG[0]_GPIO[111]
ETPUA[30] output channel
EMIOS[10] output channel
Summary of Contents for MPC5553
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