Examples Of Setting The Trigger Conditions Of The I 2 C Bus Signal - YOKOGAWA DL7480 User Manual

Examples of Setting the Trigger Conditions of the I
Start condition
SDA
SCL
IM 701450-51E
This section will indicate the data sequence in bytes (hexadecimal notation) and indicate
the position where the trigger will occur. The symbols used in the figures are as follows:
S: Start condition
Sr: Restart condition
P: Stop condition
Shaded area: Byte pattern to be compared
Non-ACK Trigger
A trigger is activated when the Acknowledge bit is not present (when the SDA signal is
set to "H").
Acknowledge bit
Address + R/W bit
Acknowledge present (L)
1 2 3 4 5 6 7 8 9
Note
The Non-Ack trigger does not apply to start byte and Hs mode master code.
Address & Data Trigger
• Activate a Trigger Only on the Start Condition
Trigger Condition
Address Pattern:
Data 1 Pattern:
Condition:
Data 2 Pattern:
Condition:
Ignore the Restart Condition:
Ignore Unexpected Start/Stop Condition:
<Byte Count=0>
Address + R/W bit
S A4 25 AE 57
Trigger activated here
<Byte Count=3>
Address + R/W bit
S A4 25 AE 57
2. Trigger activated here
1. Skip 3 bytes
2
1.4 Setting the I C Bus Signal Acquisition Conditions
2
C Bus Signal
Data byte
...
...
1 2 3 4 5 6 7 8 9
Trigger activated here
Not applicable
Not applicable
True
Not applicable
True
No
No
98 99 27
27 FE
98 99 27
27 FE
Stop condition
Acknowledge not present (H)
P
P
1-15
1