Texas Instruments CBL Manual Book page 43

Trigger Threshold (Continued)
Hardware Trigger Threshold: Hardware triggering is selected by
either of the following:
¦
Trigger Channel in
Source in
¦
Operation 5 (Period) or 6 (Frequency) is selected in
Trigger Type selected in
nibble). (Refer to pages 71–72.)
Note: Rising-edge polarity is selected automatically when Trigger Type
is 0, 1, or 1nnnn.
Software Trigger Threshold: The threshold is a "software" value that
is converted to an analog-to-digital converter value for determining the
trigger event. Software triggering is selected by the following (all are
required):
¦
Trigger Channel is set to 1, 2, or 3.
¦
Trigger Type is set to 2, 3, 4, or 5.
¦
Period or Frequency operation is not selected.
Note: If an external clock is used with a software trigger, the hardware
threshold for External Clock Source = 1 is set to 1 Volt.
Prestore Data Percentage (%)
This parameter selects the percentage of the number of samples to
collect before the trigger condition is met. (Default:
"Triggering with Prestore Reference Information" in Appendix A.)
0 –100
For example, a prestore data value of 10 results in 10% of the data being
collected before triggering and 90% of the data being collected after
triggering.
Note: This parameter is ignored if Post-Processing is 3 (Statistics) in
CMD1 .
CMD3
is set to 1.
CMD3
Percentage (integer value) of samples to collect.
is set to 21 ( DIG IN
CMD3 is 0, 1, 2, 3, 4, 5, or 1nnnn (Digital
CBLé System Guidebook
), and External Clock
CMD1 and
) (Refer to
0
43