11 I
2
C/SPI Triggering and Serial Decode
288 InfiniiVision 7000B Series Oscilloscopes User’s Guide
I
2
C Serial Decode
To set up the oscilloscope to capture I
2
C signals, see “Setup for I2C
Signals” on page 282.
To set up I
2
C serial decode:
1 Press [Serial]; then, select the I
2
C serial decode mode.
2 Choose 7-bit or 8- bit address size. Use 8- bit address size to include the
R/W bit as part of the address value, or choose 7- bit address size to
exclude the R/W bit from the address value.
3 If the decode line does not appear on the display, press the [Serial] key
to turn it on.
4 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 I
2
C data while
LIN triggering is selected.
For I
2
C triggering setup see “I2C Triggering” on page 284.
If the setup does not produce a stable trigger, the I
2
C 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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