mc68181 Freescale Semiconductor, Inc, mc68181 Datasheet - Page 8

• Manufacturer Part Number: mc68181
• Description: Signal Processor
• Manufacturer: Freescale Semiconductor, Inc

MC68181
Serial Peripheral Interface (SPI)
SERIAL PERIPHERAL INTERFACE (SPI)
RECEIVER CONTROL LINES
1-4
SCK
SS
MOSI
MISO
READY
S0–S7
Signal
Signal
Name
Name
Output
Input
Input
Input
Output
Output
Signal
Type
Signal Type
Input
Input
Input
Tri-stated
Output, driven
high
State during
Table 1-6 Serial Peripheral Interface (SPI) Signals
Reset
MC68181 Technical Data Sheet
Freescale Semiconductor, Inc.
Tri-stated
For More Information On This Product,
State during
Table 1-7 Receiver Control Lines
Reset
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.
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Control Line 0–Control Line 7 —These signals are the
eight receiver control lines.
Signal Description
Signal Description
MOTOROLA