Technical data

82 4000 X-Series Oscilloscopes Advanced Training Guide
4 Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
17 Tap the Lister softkey; then select Window and tap Half-Screen to show a
list of Serial 1 (I2C).
Your scope should now be decoding I
2
C serial bus traffic as shown in
Figure 51. We can see automatic decoding of this I
2
C bus in two formats.
The blue trace at the bottom of the display shows time- aligned decoding of
the serial bus traffic, while the lister table at the top of the display shows
I
2
C decoding in a tabular format.
I
2
C addresses can be decoded in either an 8- bit or 7- bit format. The MSB
of an 8-bit address byte is the READ/WRITE bit, while the lower seven
bits define the address. The scope already detects the MSB of the address
byte and symbolically decodes it as to whether the address byte is a Read
or Write instruction. So the typical address decoding format most
engineers prefer is the 7- bit format, which is what we have selected. But
you also have the option of seeing the address byte in an 8- bit format,
which will include the MSB Read/Write bit.
Figure 51 Decoding I
2
C serial bus traffic.