MC68HC908AS60MFN MOTOROLA [Motorola, Inc], MC68HC908AS60MFN Datasheet - Page 268
MC68HC908AS60MFN
Manufacturer Part Number
MC68HC908AS60MFN
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AS60MFN.pdf
(454 pages)
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Serial Peripheral Interface (SPI)
18.6.3 Transmission Format When CPHA = 1
Technical Data
268
CAPTURE STROBE
FOR REFERENCE
FROM MASTER
SCK CPOL = 0
SCK CPOL = 1
SCK CYCLE #
FROM SLAVE
SS TO SLAVE
MOSI
MISO
Figure 18-5. Transmission Format (CPHA = 1)
Figure 18-5
logic 1. The figure should not be used as a replacement for data sheet
parametric information. Two waveforms are shown for SCK: one for
CPOL = 0 and another for CPOL = 1. The diagram may be interpreted
as a master or slave timing diagram since the serial clock (SCK), master
in/slave out (MISO), and master out/slave in (MOSI) pins are directly
connected between the master and the slave. The MISO signal is the
output from the slave, and the MOSI signal is the output from the master.
The SS line is the slave select input to the slave. The slave SPI drives
its MISO output only when its slave select input (SS) is at logic 0, so that
only the selected slave drives to the master. The SS pin of the master is
not shown but is assumed to be inactive. The SS pin of the master must
be high or must be reconfigured as general-purpose I/O not affecting the
SPI. (See
begins driving its MOSI pin on the first SPSCK edge. Therefore, the
slave uses the first SPSCK edge as a start transmission signal. The SS
pin can remain low between transmissions. This format may be
preferable in systems having only one master and only one slave driving
the MISO data line.
Freescale Semiconductor, Inc.
MSB
MSB
1
For More Information On This Product,
18.7.2 Mode Fault
BIT 6
BIT 6
Serial Peripheral Interface (SPI)
2
Go to: www.freescale.com
shows an SPI transmission in which CPHA (SPCR) is
BIT 5
BIT 5
3
BIT 4
BIT 4
4
Error.) When CPHA = 1, the master
BIT 3
BIT 3
5
BIT 2
BIT 2
6
MC68HC908AS60 — Rev. 1.0
BIT 1
BIT 1
7
LSB
8
LSB
MOTOROLA
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