Functional Description
4-Channel SPO Digital Oscilloscopes
133
X - DECODE
I2C Serial Bus Decode (cont‟d)
The 26th clock edge front trigger occurs for the following frame format :
(Start :Address byte 1 :Write :Address byte 2 : Ack : Data)
Data2 set to «
0xXX
»
The 34th clock edge trigger occurs for the following frame format :
(Start :Address byte 1 :Write :Address byte 2 : Ack : Data: Ack: Data)
Data2 must have a value other than « 0xXX », such as «
0x02
»
Data Length :
The oscilloscope triggers when the data lentgh is equal to the set «
Byte Length
» value:
4°
If you have selected the «
EEPROM Data Read
» condition :
Press the «
Limit Range
» button to set the oscilloscope to trigger when data is
=
(equal),
<
(less than), or
>
(greater than)
the « Data1 » value.
5°
If you have selected the «
7-bit Address&Data
» or «
10-bit Address&Data
» condition:
a) Press the «
Address
» button and use the « Universal » knob to select the device
address length range : 7-bit (from 0x00 to 0x7F hexadecimal) or 10-bit (from 0x00 to
0x3FF). The oscilloscope will trigger on a Write or Read frame if the set frame [Start,
Address, Read/Write, Acknowledge and Data] occurs.
Note
: If don’t care is selected 0xXX (7-bit Address) or 0xXXX (10-bit Address), the adrress
will be ignored. The trigger will always occur on the 17th clock edge (7-bit Address) or the
26th clock edge (10-bit Address).
b) Press the «
Data1
» or «
Data2
» button and use the « Universal » knob to set the 8-bit
data byte value (from 0x00 to 0xFF). The oscilloscope will trigger if the set frame [
Start,
Address, Read/Write, Acknowledge and Data
] occurs.
c) If don’t care « 0xXX » is selected, the data will be ignored. The trigger will always occur
on the 17th clock adge (7-bit Address) or the 26
th
clock edge (10-bit Address).