MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
20-29
20.3.2.11 DSPI DSI Serialization Data Register (DSPIx_SDR)
The DSPI
x
_SDR contains the signal states of the parallel input signals from the eTPU or the eMIOS. The
pin states of the parallel input signals are latched into the DSPI
x
_SDR on the rising edge of every system
clock. The DSPI
x
_SDR is read-only. When the TXSS bit in the DSPI
x
_DSICR is negated, the data in the
DSPI
x
_SDR is the source of the serialized data.
17–19
DSICTAS
[0:2]
DSI clock and transfer attributes select. The DSICTAS field selects which of the
DSPIx_CTARs is used to provide transfer attributes in DSI configuration. The DSICTAS
field is used in DSI master mode. In DSI slave mode, the DSPIx_CTAR1 is always
selected. The table below shows how the DSICTAS values map to the DSPIx_CTARs.
20–23
—
Reserved.
24–25
—
Reserved, but implemented. These bits are writable, but have no effect.
26–31
DPCSn
DSI peripheral chip select n. The DPCS bits select which of the PCS signals to assert
during a DSI transfer. The DPCS bits only control the assertions of the PCS signals in
DSI master mode.
0 Negate PCSn
1 Assert PCSn
Table 20-12. DSPIx_DSICR Field Descriptions (Continued)
Bits
Name
Description
DSICTAS
DSI Clock and Transfer Attributes
Controlled by
000
DSPIx_CTAR0
001
DSPIx_CTAR1
010
DSPIx_CTAR2
011
DSPIx_CTAR3
100
DSPIx_CTAR4
101
DSPIx_CTAR5
110
DSPIx_CTAR6
111
DSPIx_CTAR7
Summary of Contents for MPC5553
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