Deserial Serial Peripheral Interface (DSPI)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 20-43
20.4.4.5.2 Change In Data Control
For change in data control, a transfer is initiated when the data to be serialized has changed since the
transfer of the last DSI frame. A copy of the previously transferred DSI data is stored in the
DSPIx_COMPR. When the data in the DSPIx_SDR or the DSPIx_ASDR is different from the data in the
DSPIx_COMPR, a new DSI frame is transmitted. The TXSS bit in the DSPIx_DSICR selects which
register the DSPIx_COMPR is compared to. The MTRIG output signal is asserted every time a change in
data is detected.
20.4.4.5.3 Triggered Control
For triggered control, initiation of a transfer is controlled by the internal hardware trigger signal (ht). The
TPOL bit in the DSPIx_DSICR selects the active edge of ht. For ht to have any affect, the TRRE bit in the
DSPIx_DSICR must be set.
20.4.4.5.4 Triggered or Change In Data Control
For triggered or change in data control, initiation of a transfer is controlled by the ht signal or by the
detection of a change in data to be serialized.
20.4.4.6 DSPI Connections to eTPUA, eTPUB, eMIOS and SIU
The four DSPI blocks connect to the input and output channels of the eTPUs and the eMIOS. The MCU
connects to eTPUA, eTPUB, eMIOS, and SIU. Some of the DSPI outputs connect to the external interrupt
input multiplexing subblock in the SIU. See Section 6.4.3, “External Interrupt,” and Section 19.4.3.4,
“External Trigger Event Detection,” for details on how the DSPI deserialized outputs can be used to trigger
external interrupt requests and Section 18.3.2, “Output and Input Channel Signals” for a discussion on
eTPU connections.
20.4.4.6.1 DSPI A Connectivity
The DSPI A connects to the eTPUB as shown in Figure 20-21.
Figure 20-21. DSPI A Connectivity
Table 20-19 lists the DSPI A connections.
Table 20-19. DSPI A Connectivity Table
Connected to:
DSPI A
IN[n]
DSPI A
OUT[n]
Connected to:
eTPUB Output Channel 15 0 0 N/C
1
eTPUB Output Channel 14 1 1 N/C
eTPUB
CH 15
CH 0
•
•
•
•
DSPI A
IN 0
IN 15
•
•
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