12
External
External
External
External controlled (ext. ctrl.)
controlled (ext. ctrl.)
controlled (ext. ctrl.)
controlled (ext. ctrl.)
This trigger mode uses the external trigger input to control the internal pulse generator. It is used to
generate a number of pulses per rising of falling edge of the external trigger input. Setting the
TRG_EDGE bit in the LSTAT register to “1” uses the rising edge, setting it to “0” uses the falling
edge.
The following diagram shows an example of generated pulses. The lower graph shows the external
pulse input, the upper two graphs the trigger pulses generated out of it.
meaning
T
1
enabling of the output
T
2
-T
3
Pulse rise time. It depends on the load inductance.
T
4
-T
5
Pulse fall time. It depends on the load inductance.
T
6
disabling of the output
T
7
re-enabling of the output
