8.7.15 SPI Trigger (Option)
In SPI trigger, after the CS or timeout condition is satisfied, the oscilloscope triggers
when the specified data is found. When using SPI trigger, you need to specify the CLK
clock sources and MISO data sources.
Below is the sequential chart of SPI bus.
SDA
SCL
CS
D7
D6 D5
D4 D3
D2 D1 D0
Figure 8.17 Sequential Chart of SPI Bus
Trigger Type:
Press
Type, and then rotate the multifunction knob to select "SPI". Press down the
knob to select the trigger type. Then, the current trigger setting information is
displayed at the upper-right corner of the screen, as shown in the figure below. You
can also press
Type continuously or enable the touch screen to select it.
Source Selection:
Press CLK and MISO to specify the sources of CLK and MISO respectively. They can be
set to CH1-CH4 or D0-D15. For details, refer to descriptions in "
Trigger Source
". The
current trigger source is displayed at the upper-right corner of the screen.
NOTE
Only when we select the channel (that has been input with signals) as the trigger source, can
we obtain a stable trigger.
Edge Type:
Press Slope continuously to select the desired clock edge type. Press down the knob
to select it.
•
Rising: samples the MISO data on the rising edge of the clock.
• Falling: samples the MISO data on the falling edge of the clock.
Trigger Condition:
To Trigger the Oscilloscope
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