MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 258
MC68HC08AZ60ACFU
Manufacturer Part Number
MC68HC08AZ60ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC08AZ60ACFU.pdf
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Serial Peripheral Interface (SPI)
17.6.3 Transmission Format When CPHA = ‘1’
Advance Information
258
(FOR REFERENCE)
CAPTURE STROBE
(FROM MASTER)
SCK (CPOL =’0’)
SCK (CPOL =1)
SS (TO SLAVE)
(FROM SLAVE)
SCK CYCLE #
MOSI
MISO
Figure 17-4. Transmission Format (CPHA = ‘0’)
Figure 17-5. Transmission Format (CPHA = ‘1’)
Figure 17-5
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 Mode Fault Error. When CPHA = ‘1’, the master 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.
MSB
MSB
1
BIT 6
BIT 6
Serial Peripheral Interface (SPI)
2
shows an SPI transmission in which CPHA is ‘1’. The figure
BIT 5
BIT 5
3
BIT 4
BIT 4
4
BIT 3
BIT 3
5
BIT 2
BIT 2
6
MC68HC08AZ60A — Rev 0.0
BIT 1
BIT 1
7
LSB
LSB
8
MOTOROLA
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