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84 User Manual
I2C Triggering
This part introduces the nine trigger conditions (Start, Stop, Restart, No Ack, EEPROM,
7 Bit Addr & Data, 10 Bit Addr & Data and Data Length) and the methods of setting them.
Introduction to the trigger conditions
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Start Condition — the oscilloscope will be triggered when the SDA signal
transitions from a high to a low while the SCL clock is high. If it is the trigger
condition (including frame triggers), a restart will be treated as a “Start condition”.
●
Stop Condition — the oscilloscope will be triggered when SDA transitions from
low to high while the SCL is high.
●
Restart — the oscilloscope will be triggered when another “Start condition” occurs
before a “Stop condition” .
●
No Ack — the oscilloscope will be triggered when SDA data is high during any
SCL’s ACK bit.
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EEPROM — the trigger searches for EEPROM control byte (the value is 1010xxx)
on the SDA bus. And there is a Read bit and a ACK bit following EEPROM. Using
Limit Range softkey to set the qualifier and Data1 softkey to set the data’s value.
If EEPROM’s data is greater (less, equal) than Data1, the oscilloscope will be
triggered at the edge of ACK bit behind Data byte. It’s unnecessary that the Data
byte musts follow the EEPROM.