3-38
Triggering the Oscilloscope
To use SPI triggering
Set up the number of bits in the serial data string and set
values for those data bits
1 Turn the Entry knob to set the number of bits (#Bits) in the serial data
string. The number of bits in the string can be set anywhere from 4 bits
to 32 bits. The data values for the serial string are displayed in the Data
string in the waveform area.
2 Turn the Entry knob to select a specific data bit in the serial string as
shown in the
Bit softkey.
As you rotate the Entry knob, the bit is highlighted in the Data string shown in
the waveform area.
3Press the L H X softkey to set the bit selected in the Bit softkey to L (low),
H (high), or X (don’t care).
Repeat steps 2 and 3 to assign values for all bits.
Resetting all bits in the serial data string to one value.
• To reset all of the bit values in the serial data string to one value
(L,H,orX):
a Press the L H X softkey to select your reset bit value.
b Press the Set all Bits softkey to reset the data string to the selected value.
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