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Deserial Serial Peripheral Interface (DSPI)
MPC5566 Microcontroller Reference Manual, Rev. 2
20-42
Freescale Semiconductor
20.4.4.4
DSI Deserialization
When all bits in a DSI frame have been shifted in, the frame is copied to the DSPI
x
_DDR. This register
presents the deserialized data as parallel output signal values. The DSPI
x
_DDR is memory mapped to
allow host software to read the deserialized data directly.
shows the DSI deserialization logic.
for more information on the DSPI
x
_DDR.
Section 20.3.2.14, “DSPI DSI Deserialization Data Register (DSPIx_DDR)
Figure 20-20. DSI Deserialization Diagram
20.4.4.5
DSI Transfer Initiation Control
Data transfers for a master DSPI in DSI configuration are initiated by a condition. When chaining DSPIs,
the master and all slaves must be configured for the transfer initiation. The transfer initiation conditions
are selected by the TRRE and CID bits in the DSPI
x
_DSICR.
lists the four transfer initiation conditions.
20.4.4.5.1
Continuous Control
For continuous control, the initiation of a transfer is based on the baud rate at which data is transferred
between the DSPI and the external device. The baud rate is set in the DSPI
x
_CTAR selected by the
DSICTAS field in the DSPI
x
_DSICR. A new DSI frame shifts out when the previous transfer cycle has
completed and the delay after transfer (t
DT
) has elapsed.
Table 20-18. DSI Data Transfer Initiation Control
DSPI
x
_DSICR Bits
Type of Transfer Initiation Control
TRRE
CID
0
0
Continuous
0
1
Change in data
1
0
Triggered
1
1
Triggered or change in data
SIN
Control
logic
0 1 • • • • • 15
Shift register
16
Slave bus interface
Parallel
DSI deserialization
data register
outputs
16
Содержание MPC5566
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