37.5.7 Triggers

The enhanced CVD can be set to start the enabled Scan Descriptors upon two possible trigger events. One is a software trigger SFR bit and another trigger is from any of EVSYS generators. See Event System (EVSYS) from Related Links.

If a scan descriptor is set to run in the continuous mode, it runs when it receives a trigger and stays enabled. The CVD module then waits for the next trigger to run the next enabled scan descriptor. Alternatively, the scan descriptor may instruct the CVD module to continue scanning the one descriptor on every trigger until a threshold is met. These modes allow the CVD module to run autonomously, being triggered by a system timer while the CPU sleeps (Idle mode or Standby Sleep mode), and interrupt the CPU to wake it if a tough threshold is reached. The first mode is useful for scanning various portions of the panel at regular intervals. The second mode is useful for scanning a low-resolution scan on every trigger, then, moving to a higher resolution scan descriptor if a threshold is met.