MAC7200 datasheet(690/976 Pages) FREESCALE

Part #	MAC7200

Description	MAC7200 Microcontroller Family Reference Manual

PDF	976 Pages

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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690 / 976 page

Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

612

Freescale Semiconductor

Figure 30-19. DSPI Modified Transfer Format (MTFE=1, CPHA=1, Fsck = Fsys/4)

30.12.5.5 Continuous Selection Format

Some peripherals must be deselected between every transfer. Other peripherals must remain selected

between several sequential serial transfers. The Continuous Selection Format provides the flexibility to

handle both cases. The Continuous Selection Format is enabled for the SPI Configuration by setting the

CONT bit in the SPI command.

When the CONT bit = 0, the DSPI drives the asserted Chip Select signals to their idle states in between

frames. The idle states of the Chip Select signals are selected by the PCSIS field in the DSPI_MCR.

Figure 30-20 shows the timing diagram for two four-bit transfers with CPHA = 1 and CONT = 0.

tCSC

SCK

System clock

Master

Slave

PCS

Slave

Master

SOUT

Sample

tCSC = PCS to SCK delay

tASC

tASC = After SCK delay

MAC7200 Datasheet(PDF) 690 Page - Freescale Semiconductor, Inc