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SHS800X&SHS1000X User Manual
88
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will be interpreted as a start or stop condition (data transitioning while the
clock is high))
7. Press the
softkey to return previous menu.
I2C Trigger
This part introduces the nine kinds of trigger conditions (Start, Stop, Restart, No
Ack, EEPROM, 7 Addr&Data, 10 Addr&Data and Data Length) and the methods of
setting them.
Trigger Conditions
Start Condition— the oscilloscope will be triggered when SDA signal
transitions from high to low while the SCL clock is high. If it is chosen as 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.
EEPROM — the trigger searches for EEPROM control byte (the value is 1010xxx)
on the SDA bus. And there is a Read bit and an ACK bit behind 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. The Data byte
musts don’t have to follow the EEPROM.
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