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There are four hardware time stamp inputs (HW1/4_TS_PUSH) that can cause hardware time stamp push events to be loaded into the Event FIFO. Each hardware time stamp input is internally connected to the PORTIMERPWM output of each timer as shown in Figure 24-208.
Figure 24-208 HW1/4_TSP_PUSH ConnectionThe event is loaded into the event FIFO on the rising edge of the timer, and the PORT_NUMBER field in the CPTS_EVENT_HIGH register indicates the hardware time stamp input that caused the event.
Each hardware time stamp input must be asserted for at least 10 periods of the selected RCLK clock. Each input can be enabled or disabled by setting the respective bits in the CPTS_CONTROL register.
Hardware time stamps are intended to be an extremely low frequency signals, such that the event FIFO does not overrun. Software must keep up with the event FIFO and ensure that there is no overrun, or events will be lost.