Datasheet

Serial Peripheral Interface (SPI) Signals
56F805 Technical Data, Rev. 16
Freescale Semiconductor 15
2.8 Serial Peripheral Interface (SPI) Signals
Table 2-12 Serial Peripheral Interface (SPI) Signals
No. of
Pins
Signal
Name
Signal
Type
State During
Reset
Signal Description
1 MISO
GPIOE6
Input/
Output
Input/
Output
Input
Input
SPI Master In/Slave Out (MISO)—This serial data pin is an input to
a master device and an output from a slave device. The MISO line
of a slave device is placed in the high-impedance state if the slave
device is not selected.
Port E GPIO—This pin is a General Purpose I/O (GPIO) pin that
can individually be programmed as an input or output pin.
After reset, the default state is MISO.
1 MOSI
GPIOE5
Input/
Output
Input/
Output
Input
Input
SPI Master Out/Slave In (MOSI)—This serial data pin is an output
from a master device and an input to a slave device. The master
device places data on the MOSI line a half-cycle before the clock
edge that the slave device uses to latch the data.
Port E GPIO—This General Purpose I/O (GPIO) pin can be
individually programmed as an input or output pin.
After reset, the default state is MOSI.
1 SCLK
GPIOE4
Input/
Output
Input/
Output
Input
Input
SPI Serial Clock—In master mode, this pin serves as an output,
clocking slaved listeners. In slave mode, this pin serves as the data
clock input.
Port E GPIO—This General Purpose I/O (GPIO) pin can be
individually programmed as an input or output pin.
After reset, the default state is SCLK.
1 SS
GPIOE7
Input
Input/
Output
Input
Input
SPI Slave Select—In master mode, this pin is used to arbitrate
multiple masters. In slave mode, this pin is used to select the slave.
Port E GPIO—This General Purpose I/O (GPIO) pin can be
individually programmed as an input or output pin.
After reset, the default state is SS
.