Deserial Serial Peripheral Interface (DSPI)
Freescale Semiconductor
25-57
PXR40 Microcontroller Reference Manual, Rev. 1
details. To work in TSB configuration the DSPI must be in master mode and configured as DSI (DCONF
= 0b01). The TSB allows operating in Continuous and Non Continuous Serial Communication Clock
(controlled by bit CONT_SCKE).
shows the signals used in the TSB interface. The SDR and ASDR registers are set to 32 bits
in this configuration, to allow the Micro Second Channel (MSC) feature to be performed.
In the TSB configuration the DSPI manage to send from 4 up to 32 bits data. These bits source data can
be either from the DSPI DSI Alternate Serialization Data Register (DSPI_ASDR), written by the host
software, or from Parallel Input pin states latched into the DSPI DSI Serialization Data Register
(DSPI_SDR).
Figure 25-37. DSPI usage in the TSB Configuration
The same constraints applied to DSI are valid to TSB, but the frame size and the Delay After Transfer value
(t
DT
). The TSB configuration allows from 4 to 32 bits frame size to be used, and t
DT
can be programmable
to a minimum of 1xT
SCK
, allowing a programmable inter-message gap. See
for details on programming the t
DT
values.
The time between the negation of the CS at the end of one frame to the assertion of CS at the next frame
is defined by: T
DT
= P
DT
* DT / f
periph,
but delayed until the next active edge of T
SCK
. The gap is only be
whole period of TSCK and the PDT and DT fields of the specific DSPI_CTAR0-7 register select the delay
after transfer. Some values will not be possible, see the reference manual for details.
SOUT (Downstream Frame)
SCK
PCS
DSI
(Master)
32 Bit Data
Register
(ASDR)
32 Bit
(SDR)
Serial Data
GPIO or COMMAND
Data Writes
Parallel
Inputs
Summary of Contents for PXR4030
Page 1: ...PXR40 Microcontroller Reference Manual Devices Supported PXR4030 PXR4040 PXR40RM Rev 1 06 2011...
Page 30: ...PXR40 Microcontroller Reference Manual Rev 1 Freescale Semiconductor xxx...
Page 40: ...PXR40 Microcontroller Reference Manual Rev 1 xl Freescale Semiconductor...
Page 66: ...Memory Map PXR40 Microcontroller Reference Manual Rev 1 2 4 Freescale Semiconductor...
Page 120: ...Signal Descriptions 3 54 Freescale Semiconductor PXR40 Microcontroller Reference Manual Rev 1...
Page 860: ...FlexCAN Module 24 50 Freescale Semiconductor PXR40 Microcontroller Reference Manual Rev 1...
Page 1167: ...Decimation Filter Freescale Semiconductor 28 53 PXR40 Microcontroller Reference Manual Rev 1...
Page 1168: ...Decimation Filter 28 54 Freescale Semiconductor PXR40 Microcontroller Reference Manual Rev 1...
