Deserial Serial Peripheral Interface (DSPI)MPC5566 Microcontroller Reference Manual, Rev. 220-6 Freescale Semiconductor20.2 External Signal Description20.2.1 Signal OverviewTable 20-1 lists off-chip DSPI signals.20.2.2 Signals and Descriptions20.2.2.1 Peripheral Chip Select / Slave Select (PCSx[0]_SS)In master mode, the PCSx[0] signal is a peripheral chip select output that selects the slave device for thecurrent transmission.In slave mode, the SS signal is a slave select input signal that allows a SPI master to select the DSPI as thetarget for transmission. PCSx[0]_SS must be configured as input and pulled high. If the internal pullup isused then the bits in the SIU_PCR must be set (SIU_PCR [WPE = 1], [WPS = 1]).Set the input buffer enable (IBE) and the output buffer enable (OBE) bits to 1 in the SIU_PCR for allPCSx[0] pins when the DSPI chip select or slave select primary function is configured for that pin. Whenthe pin is used for DSPI master mode as a chip select output, set the OBE bit. When the pin is used in DSPIslave mode as a slave select input, set the IBE bit to 1.See Section 6.3.1.12, “Pad Configuration Registers (SIU_PCR),” for more information.20.2.2.2 Peripheral Chip Selects 1–3 (PCSx[1:3])PCSx[1:3] are peripheral chip select output signals in master mode. In slave mode these signals are notused.Table 20-1. Signal PropertiesName I/O TypeFunctionMaster Mode Slave ModePCSx[0]_SS Output / input Peripheral chip select 0 Slave selectPCSx[1:3] Output Peripheral chip select 1–3 Unused 11 The SIU allows you to select alternate pin functions for the device.PCSx[4]_MTRIG Output Peripheral chip select 4 Master triggerPCSx[5]_PCSS Output Peripheral chip select 5 /Peripheral chip select strobeUnused 1SINx Input Serial data in Serial data inSOUTx Output Serial data out Serial data outSCKx Output / input Serial clock (output) Serial clock (input)
