Keysight InfiniiVision HD3 Series - Page 332

332 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
26 I2C Triggering and Protocol Decode
• SCL, SDA — Select the channel for the signal.
The SCL and SDA labels for the source channels are automatically set.
• Threshold — Select the signal threshold voltage level.
The threshold voltage level is used in decoding, and it will become the trigger
level when the trigger type is set to the selected serial decode slot.
Data must be stable during the whole high clock cycle or it will be interpreted
as a start or stop condition (data transitioning while the clock is high).
Settings The I2C protocol decode mode Settings subtab has these controls for decode
settings:
• Address Size — 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.
• Base — Selects between Hex or Binary data value display.
Notes • I2C triggering and serial decode is included with the Embedded Serial Analysis
license.
• If the decode line does not appear on the display, press the [Protocol Decode] key
to turn it on.
• If the oscilloscope is stopped, press the [Run/Stop] key to acquire and decode
data.
• If the setup does not produce a stable trigger, the I2C signals may be slow
enough that the oscilloscope is Auto triggering. Press the [Mode] key to set the
trigger mode from Auto to Trig'd.