SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7
20.4.5.3.3.3 Asynchronous Counter Start – Ignore Stop Events
In this scenario the user:
- Wants to measure the time between the start event and the Nth stop event, where N > 0:
- Sets AUX_TDC:TRIGCNTLOAD to N minus 1.
- Sets AUX_TDC:TRIGCNTCFG.EN = 1 to enable the stop counter.
- Starts the TDC measurement by writing AUX_TDC:CTL.CMD = 2.
- Assures that the start event is low until AUX_TDC.STAT.STATE = WAIT_START.
- Assures that the stop event goes high later than the start event.
Figure 20-20 shows the scenario when N = 2, which ignores 1 stop event.
Figure 20-20 Arbitrary Time Measurement 3
Table 20-28 lists the associated timing requirements for this scenario.
Table 20-28 Arbitrary Time Measurement 3
| Description | Label | Requirement |
|---|---|---|
| Minimum high time, start | t_minH_start | 42 ns |
| Minimum high time, stop | t_minH_stop | 42 ns |
| Minimum low time, stop | t_minL_Stop | 168 ns |
| Minimum stop event period | t_min | 210 ns |
| Minimum delay | TRIGCNTLOAD > 0 | t_d | 168 ns |
| Minimum delay | TRIGCNTLOAD = 0 | t_d | 292 ns |