MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
20-47
The source for the SIN input of a DSPI can be a pin or the SOUT of any of the other three (for the
MPC5554) DSPIS or two (for the MPC5553) DSPIs. The source for the SS input of a DSPI can be a pin
or the PCS0 signal from any of the other DSPIs. The source for the SCK input of a DSPI can be a pin or
the SCK output of any of the other DSPIs. The source for the hardware trigger (
ht
) input can be the MTRIG
signal from any of the other DSPIs. The DSPI input select register (SIU_DSR) selects the source for each
DSPI SIN, SS, SCK, and
ht
signal individually.
20.4.4.7.2
Parallel Chaining
Parallel chaining allows the PCS and SCK signals from a master DSPI to be shared by internal slave DSPIs
and external slave SPI devices. Signal sharing reduces DSPI pin utilization. An example of a parallel chain
is shown in
Figure 20-27. Example of Parallel Chaining of DSPIs in the MPC5554
SOUT
ht
SCK
SIN
MTRIG
SS
MPC5554
DSPI_A
SOUT
ht
SCK
SIN
PCS0
SI
N_
A
PCS_A0
SCK_A
SOUT_A
SI
N_
B
(Master)
DSPI_B
(Slave)
SOUT
SCK
SIN
MTRIG
SS
DSPI_C
(Slave)
SOUT_B
SIN_C
SOUT_C
SCK
SS
SIN
Slave Device
SPI
SOUT
SCK
SS
SIN
Slave Device
SPI
SOUT
SCK
SS
SIN
Slave Device
SPI
SOUT
Summary of Contents for MPC5553
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