Deserial Serial Peripheral Interface (DSPI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
19-6
Freescale Semiconductor
19.1.4.4
Debug Mode
Debug mode is used for system development and debugging. If the device enters debug mode while the
FRZ bit in the DSPI
x
_MCR is set, the DSPI halts operation on the next frame boundary. If the device enters
debug mode while the FRZ bit is cleared, the DSPI behavior is unaffected and remains dictated by the
module-specific mode and configuration of the DSPI.
For more information, refer to
.”
19.2
External Signal Description
19.2.1
Signal Overview
lists off-chip DSPI signals.
19.2.2
Signal Names and Descriptions
19.2.2.1
Peripheral Chip Select / Slave Select (PCS
x
[0] / SS
)
In master mode, the PCS
x
[0] signal is a peripheral chip select output that selects the slave device to which
the current transmission is intended.
In slave mode, the SS signal is a slave select input signal that allows an SPI master to select the DSPI as
the target for transmission. 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]).
Set the IBE and OBE bits in the SIU_PCR for all PCSx[0] pins when the DSPI chip select or slave select
primary function is selected for that pin. When the pin is used for DSPI master mode as a chip select output,
set the OBE bit. When the pin is used in DSPI slave mode as a slave select input, set the IBE bit.
Table 19-1. Signal Properties
Name
I/O Type
Function
Master Mode
Slave Mode
PCS
x
[
0] / SS
Output / input
Peripheral chip select 0
Slave select
PCS
x
[1:3]
Output
Peripheral chip select 1–3
Unused
1
1
The SIU allows you to select alternate pin functions for the device.
PCS
x
[4] / MTRIG
Output
Peripheral chip select 4
Master trigger
PCS
x
[5] / PCSS
Output
Peripheral chip select 5 /
Peripheral chip select strobe
Unused
SIN
x
Input
Serial data in
Serial data in
SOUT
x
Output
Serial data out
Serial data out
SCK
x
Output / input
Serial clock (output)
Serial clock (input)
Summary of Contents for MPC5565
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