MC68181 Datasheet, PDF (8/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

MC68181
Freescale Semiconductor, Inc.
Serial Peripheral Interface (SPI)
SERIAL PERIPHERAL INTERFACE (SPI)
Signal
Name
SCK
SS
MOSI
MISO
READY
Signal
Type
Input
Input
Input
Output
Output
Table 1-6 Serial Peripheral Interface (SPI) Signals
State during
Reset
Input
Input
Input
Tri-stated
Output, driven
high
Signal Description
SPI Serial Clock—The SCK signal is an input, and the clock signal
from the external master synchronizes the data transfer. The SCK
signal is ignored by the SPI if the Slave Select (SS) signal is not
asserted.
SPI Slave Select—This signal is used to enable the SPI slave for
transfer.
SPI Master-Out-Slave-In—Since the MC68181 is always a slave
device, this is the data input for SPI communications. The MOSI
signal is used in conjunction with the MISO signal for transmitting
and receiving serial data.
SPI Master-In-Slave-Out—Since the MC68181 is always a slave
device, this is the data output for SPI communications. The MISO
signal is used in conjunction with the MOSI signal for transmitting
and receiving serial data.
SPI Ready—This signal is driven low when the FLEX™ chip IC is
ready for an SPI packet.
RECEIVER CONTROL LINES
Signal
Name
S0–S7
Signal Type
Output
Table 1-7 Receiver Control Lines
State during
Reset
Tri-stated
Signal Description
Control Line 0–Control Line 7—These signals are the
eight receiver control lines.
1-4
MC68181 Technical Data Sheet
MOTOROLA
For More Information On This Product,
Go to: www.freescale.com