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C/SPI Triggering and Serial Decode 11
InfiniiVision 7000B Series Oscilloscopes User’s Guide 297
SPI Serial Decode
To set up the oscilloscope to capture SPI signals, see “Setup for SPI
Signals” on page 292.
To set up SPI serial decode:
1 Press [Serial]; then, select the SPI serial decode mode.
2 Press the Word Size softkey, and use the Entry knob to select the
number of bits in a word.
3 Press Bit Order to select the bit order, most significant bit first (MSB) or
least significant bit first (LSB), used when displaying data in the serial
decode waveform and in the Lister.
4 If the decode line does not appear on the display, press the [Serial] key
to turn it on.
5 If the oscilloscope is stopped, press the [Run/Stop] key to acquire and
decode data.
You can use the Zoom horizontal sweep mode for easier navigation of the
acquired data.
Because of oscilloscope hardware resource limitations, you cannot decode SPI data while
CAN or LIN triggering is selected.
For SPI triggering setup see “SPI Triggering” on page 295.
If the setup does not produce a stable trigger, the SPI signal may be slow enough that the
oscilloscope is AutoTriggering. Press the [Mode/Coupling] key, then press the Mode
softkey to set the trigger mode from Auto to Normal.
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