Deserial Serial Peripheral Interface (DSPI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
19-5
•
Transfer initiation conditions
– Continuous
– Edge-sensitive hardware trigger
– Change in data
•
Support for parallel and serial chaining of DSPI modules
•
Pin serialization/deserialization with interleaved SPI frames for control and diagnostics
19.1.4
Modes of Operation
The DSPI has four modes of operation. These modes can be divided into two categories; module-specific
modes such as master, slave, and module disable modes, and a second category that is an MCU-specific
mode: debug mode.
The module-specific modes are entered by host software writing to a register. The MCU-specific mode is
controlled by signals external to the DSPI. The MCU-specific mode is a mode that the entire device may
enter, in parallel to the DSPI being in one of its module-specific modes.
19.1.4.1
Master Mode
Master mode allows the DSPI to initiate and control serial communication. In this mode the SCK, PCS
n
and SOUT signals are controlled by the DSPI and configured as outputs.
For more information, refer to
Section 19.4.1.1, “Master Mode
.”
19.1.4.2
Slave Mode
Slave mode allows the DSPI to communicate with SPI / DSI bus masters. In this mode the DSPI responds
to externally controlled serial transfers. The DSPI cannot initiate serial transfers in slave mode. In slave
mode, the SCK signal and the PCS
x
[0] / SS signal are configured as inputs and provided by a bus master.
PCS
x
[0] / SS must be configured as input and pulled high. If the internal pullup is being used then the
appropriate bits in the relevant SIU_PCR must be set (SIU_PCR [WPE = 1], [WPS = 1]).
For more information, refer to
.”
19.1.4.3
Module Disable Mode
The module disable mode is used for MCU power management. The clock to the non-memory mapped
logic in the DSPI is stopped while in module disable mode. The DSPI enters the module disable mode
when the MDIS bit in DSPI
x
_MCR is set.
For more information, refer to
Summary of Contents for MPC5565
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