Trigger In/Out

The emulation header is capable of producing an output pulse for external triggering and detecting an input pulse for internal triggering.

Trigger In/Out Hardware

Pins on the emulation header may be used for Trigger In/Out. Pin functions are labeled on the board silkscreen, namely:

  • GND – ground
  • TRIG IN – used for Trigger In
  • TRIG OUT – used for Trigger Out

Trigger In Operation

A pulse on the Trigger In (TRIG IN) pin can be used to generate a trigger condition, halt and/or trigger out signal. Set up Trigger In by selecting Window>Debugging>Triggers.

Selection Description
Polarity Trigger-in pin pulse polarity:
Positive: a positive-going pulse
Negative: a negative-going pulse
Noise Reduction Filter Reduce the noise on the trigger-in pin using a filter,
which helps mitigate spurious triggers from halting code.
Enable or disable this feature.
Trigger Trace Trigger trace when a pulse is received on the trigger-in pin.
Enable or disable this feature.

An Event Breakpoint can be set up to break when a Trigger In pulse is detected. See Enhanced Event Breakpoints.

Trigger Out Operation

A pulse can be output on the Trigger Out (TRIG OUT) pin based on the setting of breakpoint types:

The breakpoint may be set up so that the pulse is emitted without halting device execution.

Set up Trigger Out by selecting Window>Debugging>Triggers.

Selection Description
Polarity Trigger-out pin pulse polarity:
Positive: a positive-going pulse
Negative: a negative-going pulse
Slew Rate Limiting Limit the slew rate on the Trigger Out pulse.
Enable: slew rate is slow and limited
Disable: slew rate is as fast as possible
One Shot The trigger out pulse duration is:
Enable: a fixed width, regardless of MCU operating frequency
Disable: the length of the event itself, which is MCU frequency-dependent
Force Trigger Out Click this button to force a Trigger Out pulse.

An example of using trigger out can be found here: Trigger Out Example

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