3-27
Triggering the Oscilloscope
To use I2C triggering
10-bit Write: the oscilloscope triggers on a 10-bit write frame on the 26th clock
edge if all bits in the pattern match. The frame is in the format:
Frame (Start: Address byte 1: Write: Address byte 2: Ack: Data)
For triggering purposes, a restart is treated as a start condition.
5 If you have set the oscilloscope to trigger on an EEPROM Data Read
condition:
Press the Data is softkey to set the oscilloscope to trigger when data is = (equal
to),
≠ (not equal to), < (less than), or > (greater than) the data value set in the
Data softkey.
The oscilloscope will trigger on the clock edge for the Ack bit after the trigger
event is found. This data byte does not need to occur directly after the control
byte. The oscilloscope will trigger on any data byte that meets the criteria
defined by the Data is and Data softkeys during a current address read or a
random read or a sequential read cycle.
SCL
SDA
Start or
Restart
Condition
Trigger point
26th clock edge
Address
1st byte
Write
R/W
Ack1
DataAck2
Stop
Condition
Ack
Address
2nd byte
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