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System Integration Unit (SIU)
MPC5566 Microcontroller Reference Manual, Rev. 2
6-124
Freescale Semiconductor
An example of the multiplexing of an eQADC external trigger input is given in
.
Figure 6-172. eQADC External Trigger Input Multiplexing
Refer to
Section 6.3.1.161, “eQADC Trigger Input Select Register (SIU_ETISR)
” for the
SIU_ETISR[TSEL0]–SIU_ETISR[TSEL5] bit definitions.
6.4.5.2
SIU External Interrupt Input Multiplexing
The sixteen 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).
As shown in the figure, the IRQ[0] input of the SIU can be connected to either the IRQ[0]_GPIO[203] pin,
the PCSB[0] serial input signal, the PCSC[1] deserialized output signal, or the PCSD[2] deserialized
output signal. The remaining IRQ inputs are multiplexed in the same manner. The inputs to the IRQ from
each DSPI module are offset by one so that if more than one DSPI module is connected to the same
external device type, a separate interrupt can be generated for each device. This also applies to DSPI
modules connected to external devices of different type that have status bits in the same bit location of the
deserialized information.
An example of the multiplexing of an SIU external interrupt input is given in
.
Figure 6-173. DSPI Serialized Input Multiplexing
6.4.5.3
Multiplexed Inputs for DSPI Multiple Transfer Operation
Each DSPI module can be combined in a serial or parallel chain (multiple transfer operation). Serial
chaining allows SPI operation with an external device that has more bits than one DSPI module.
SIU_ETISR[TSEL0]
ETRIG[0]
GPIO[206]
ETRIG[0]_GPIO[111]
ETPUA[30] output channel
EMIOS[10] output channel
IRQ[0]
IRQ[0]_GPIO[203]
DSPI
B[0] serialized input
DSPI
C[1] serialized input
DSPI
D[2] serialized input
ESEL[0]
ESEL[1]
NOTE: The MPC5566 has DSPI A in addition to B, C, D.
Содержание MPC5566
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