MC9S08GB32 Motorola, MC9S08GB32 Datasheet - Page 193
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MC9S08GB32
Manufacturer Part Number
MC9S08GB32
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC9S08GB32.pdf
(290 pages)
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12.3.1
To accommodate a wide variety of synchronous serial peripherals from different manufacturers, the SPI
system has a clock polarity (CPOL) bit and a clock phase (CPHA) control bit to select one of four clock
formats for data transfers. CPOL selectively inserts an inverter in series with the clock. CPHA chooses
between two different clock phase relationships between the clock and data.
Figure 12-5
for reference with bit 1 starting at the first SPSCK edge and bit 8 ending one-half SPSCK cycle after the
sixteenth SPSCK edge. The MSB first and LSB first lines show the order of SPI data bits depending on the
setting in LSBFE. Both variations of SPSCK polarity are shown, but only one of these waveforms applies
for a specific transfer, depending on the value in CPOL. The SAMPLE IN waveform applies to the MOSI
input of a slave or the MISO input of a master. The MOSI waveform applies to the MOSI output pin from
a master and the MISO waveform applies to the MISO output from a slave. The SS OUT waveform applies
to the slave select output from a master (provided MODFEN and SSOE = 1). The master SS output goes
to active low one-half SPSCK cycle before the start of the transfer and goes back high at the end of the
eighth bit time of the transfer. The SS IN waveform applies to the slave select input of a slave.
Freescale Semiconductor
(MISO OR MOSI)
(MASTER OUT)
(REFERENCE)
(SLAVE OUT)
SAMPLE IN
MSB FIRST
BIT TIME #
(CPOL = 0)
(CPOL = 1)
LSB FIRST
(MASTER)
(SLAVE)
SS OUT
SPSCK
SPSCK
SS IN
MOSI
MISO
SPI Clock Formats
shows the clock formats when CPHA = 1. At the top of the figure, the eight bit times are shown
Figure 12-5. SPI Clock Formats (CPHA = 1)
BIT 7
BIT 0
1
MC9S08GB/GT Data Sheet, Rev. 2.3
BIT 6
BIT 1
2
...
...
...
BIT 2
BIT 5
6
BIT 1
BIT 6
7
Functional Description
BIT 0
BIT 7
8
193
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