PXD20RM Datasheet, PDF (287/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Chapter 10
Deserial Serial Peripheral Interface (DSPI)
10.1 Introduction
This chapter describes the deserial serial peripheral interface (DSPI), which provides a synchronous serial
bus for communication between the MCU and an external peripheral device.
10.2 Block diagram
A block diagram of the DSPI is shown in Figure 10-1.
eDMA
INTC
SPI
DMA and interrupt control
TX FIFO
RX FIFO
CMD TX data
RX data
16
16
Shift register
SPI baud rate,
delay and transfer
4
control
Figure 10-1. DSPI block diagram
SOUT_x
SIN_x
SCK_x
CS0_x
CS1:4_x
CS5_x
10.3 Overview
The register content is transmitted using an SPI protocol.
For queued operations the SPI queues reside in internal SRAM which is external to the DSPI. Data
transfers between the queues and the DSPI FIFOs are accomplished through the use of the eDMA
controller or through host software.
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
10-1