2.6 Serial Peripheral Interface (SPI) Signals
Table 2-8 Serial Peripheral Interface (SPI) Signals
No. of
Pins
Signal
Name
Signal
Type
StateDuring
Reset
Signal Description
1
MISO
Input/Output
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.
Input/Output
GPIOB6
MOSI
Input
Input
Port E GPIO—This pin is a General Purpose I/O (GPIO) pin that can
be individually programmed as input or output pin.
After reset, the default state is MISO.
1
Input/Output
Input/Output
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 pin is a General Purpose I/O (GPIO) pin that can
be individually programmed as input or output pin.
GPIOB5
SCLK
Input
Input
After reset, the default state is MOSI.
1
Input/Output
Input/Output
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.
GPIOB4
Input
Port E GPIO—This pin is a General Purpose I/O (GPIO) pin that can
be individually programmed as an input or output pin.
After reset, the default state is SCLK.
1
SS
Input
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 pin is a General Purpose I/O (GPIO) pin that can
be individually programmed as an input or output pin.
GPIOB7
Input/Output
After reset, the default state is SS.
56F801 Technical Data, Rev. 17
12
Freescale Semiconductor
FREESCALE [ Freescale ]
