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Chapter 5 To Trigger the Oscilloscope RIGOL
MSO8000 User's Guide 5-39
SPI Trigger ( Option)
In SPI trigger, after the CS or timeout condition is satisf ied, the oscilloscope triggers
when the specif ied data is found. When using SPI trigger, you need to specify the
SCL clock sources and SDA data sources. Below is the sequential chart of SPI bus.
SDA
SCL
CS
D7 D6 D5 D4 D3 D2 D1 D0
Figure 5-16 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 f igure below. You
can also press Type continuously to select the trigger type or enable the touch
screen to tap the desired trigger type and select it.
Source Selection:
Press SCL and SDA to specify the sources of SCL and SDA 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.
Rising: samples the SDA data on the rising edge of the clock.
Falling: samples the SDA data on the falling edge of the clock.
Trigger Condition:
Press When continuously to select the desired trigger condition.
Timeout: the oscilloscope starts to search for the data (SDA) on which to trigger
after the clock signal (SCL) stays in the idle state for a specified period of time.
After selecting this condition, you can press Timeout, then rotate the
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