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Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
Figure 39 Decoding a 2-wire SPI serial bus.
Your scope should now be decoding the MOSI/MISO serial data line similar
to
scope's default trigger condition is to trigger on a rising edge of channel- 1.
Let's now set up the scope to trigger on a MOSI data byte equal to 0000
0011 (03
19
20
21
22
23
24
25
2000 X-Series Oscilloscopes Advanced Training Guide
Figure
39. However, the scope is not yet triggering on these signals. The
).
HEX
Press the [Trigger] front panel key; then select Serial 1 (SPI) using the
Entry knob.
Press the Trigger Setup softkey.
Press the Bit softkey; then turn the Entry knob to select the MSB
(left- most bit), which is Bit 0.
Press the 0 1 X softkey to select 0 as the trigger logic condition for Bit
0 (MSB).
Press the Bit softkey to increment to the Bit 1 position.
Press the 0 1 X softkey to select 0 for Bit 1.
Repeat Steps #23 and #24 until MOSI Data = 0000 0011.
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