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System Integration Unit (SIU)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
6-125
In a serial chain, one DSPI module operates as a master, the second, third, or fourth DSPI modules operate
as slaves. The data output (SOUT) of the master is connected to the data input (SIN) of the slave. The
SOUT of a slave is connected to the SIN of subsequent slaves until the last module in the chain, where the
SOUT is connected to an external pin, which connects to the input of an external SPI device. The slave
DSPI and external SPI device use the master peripheral chip select (PCS) and clock (SCK). The trigger
input of the master allows a slave DSPI to trigger a transfer when a data change occurs in the slave DSPI
and the slave DSPI is operating in change in data mode. The trigger input of the master is connected to the
MTRIG output of the slave. If more than two DSPIs are chained in change in data mode, a chain must be
connected of MTRIG outputs to trigger inputs through the slaves with the last slave MTRIG output
connected to the master trigger input.
An example of a serial chain is shown in
Parallel chaining allows the PCS and SCK from one DSPI to be used by more than one external SPI device,
thus reducing pin utilization of the device MCU. In this example, the SOUT and SIN of the two DSPIs
connect to separate external SPI devices, which share a common PCS and SCK.
To support multiple transfer operation of the DSPIs, an input multiplexor is required for the SIN, SS, SCK
IN, and trigger signals of each DSPI. The input source for the SIN input of a DSPI can be a pin or the
SOUT of any of the other three DSPIs. The input source for the SS input of a DSPI can be a pin or the
PCS
X
[0] of any of the other three DSPIs. The input source for the SCK input of a DSPI can be a pin or the
SCK output of any of the other three DSPIs. The input source for the trigger input can be the PCSS output
of any of the other three DSPIs. The input source for each DSPI SIN, SS, SCK, and trigger signal is
individually specified in the DSPI input select register (SIU_DISR).
An example of a parallel chain is shown in
Содержание MPC5566
Страница 12: ...MPC5566 Microcontroller Reference Manual Devices Supported MPC5566 MPC5566 RM Rev 2 0 23 Apr 2008...
Страница 81: ...Introduction MPC5566 Microcontroller Reference Manual Rev 2 1 24 Freescale Semiconductor...
Страница 135: ...Signal Description MPC5566 Microcontroller Reference Manual Rev 2 2 54 Freescale Semiconductor...
Страница 189: ...Reset MPC5566 Microcontroller Reference Manual Rev 2 4 20 Freescale Semiconductor...
Страница 331: ...System Integration Unit SIU MPC5566 Microcontroller Reference Manual Rev 2 6 128 Freescale Semiconductor...
Страница 343: ...Crossbar Switch XBAR MPC5566 Microcontroller Reference Manual Rev 2 7 12 Freescale Semiconductor...
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