User`s guide

3-26

Triggering the Oscilloscope

To use I2C triggering

EEPROM Data Read: the trigger looks for EEPROM control byte value 1010xxx

on the SDA line, followed by a Read bit and an Ack bit. It then looks for the data

value and qualifier set by the Data softkey and the Data is softkey. When this

event occurs, the scope will trigger on the clock edge for the Ack bit after the

data byte. This data byte does not need to occur directly after the control byte.

Frame (Start: Addr7: Read: Ack: Data) or

Frame (Start: Addr7: Write: Ack: Data): the oscilloscope triggers on a read or write

frame in 7-bit addressing mode on the 17th clock edge if all bits in the pattern

match. For triggering purposes, a restart is treated as a start condition.

SDA

SCL

Read

Ack

R/W

Data

Trigger point

Start or

Restart Condition

Control byte

SDA

SCL

Start or

Restart

Condition

Trigger point

17th clock edge

Address

Read

Write

R/W

Ack

Data

Ack

Stop

Condition