MCCIRM Freescale Semiconductor / Motorola, MCCIRM Datasheet - Page 20

• Manufacturer Part Number: MCCIRM
• Description: MCCIRM Multi-Channel Communications Interface Reference Manual
• Manufacturer: Freescale Semiconductor / Motorola

Signal Descriptions
2.3 SPI Pins
Reference Manual
20
These four pins are associated with the SPI: MISO, MOSI, SCK, and SS.
The MPAR configures each pin for either SPI function or
general-purpose I/O. The MDDR assigns each pin as either input or
output. The WOMP bit in the SPI control register (SPCR) determines
whether each SPI pin that is configured for output functions as an
open-drain output or a normal CMOS output. The MMDR and WOMP
assignments are valid regardless of whether the pins are configured for
SPI use or general-purpose I/O.
The operation of pins configured for SCI use depends on whether the
SCI is operating as a master or a slave, determined by the MSTR bit in
the SPCR.
Table 2-1
MISO
MOSI
SCK
Pin
SS
Freescale Semiconductor, Inc.
For More Information On This Product,
Master
Master
Master
Master
Mode
Slave
Slave
Slave
Slave
summarizes SPI pins and their functions.
Go to: www.freescale.com
Signal Descriptions
Serial data input to SPI
Serial data output from SPI
Serial data output from SPI
Serial data input to SPI
Clock output from SPI
Clock input to SPI
Causes mode fault when asserted
Initiates serial transfer when asserted
Table 2-1. SPI Pins
SPI Function
Multichannel Communication Interface — Rev. 1.0
Port I/O Signal
PMC0
PMC1
PMC2
PMC3
MOTOROLA