Internal/External Clock Measurement With Tim16/Tim17; Figure 31. Frequency Measurement With Tim16 In Capture Mode; Figure 32. Frequency Measurement With Tim17 In Capture Mode - STMicroelectronics STM32WL5 Series Reference Manual

Reset and clock control (RCC)
7.2.20

Internal/external clock measurement with TIM16/TIM17

The frequency of all on-board clock sources can be indirectly measured by mean of the
TIM16 or TIM17 channel 1 input capture, as shown in
The TIM16 input capture channel can be a GPIO line or an internal clock of the MCU. This
selection is performed through the TI1_RMP[1:0] bits in the TIM16_OR register. The
possibilities are listed below:
• TIM16 channel1 is connected to the GPIO (refer to the alternate function mapping in
the device datasheets).
•
TIM16 channel1 is connected to the LSI clock.
•
TIM16 channel1 is connected to the LSE clock.
•
TIM16 channel1 is connected to the RTC wake-up interrupt signal. In this case the RTC
interrupt must be enabled.
302/1450

Figure 31. Frequency measurement with TIM16 in capture mode

GPIO
LSI
LSE
RTC wakeup interrupt

Figure 32. Frequency measurement with TIM17 in capture mode

GPIO
MSI
HSE/32
MCO
RM0453 Rev 5
Figure 31
TIM16
TI1_RMP[1:0]
TI1
TIM17
TI1_RMP[1:0]
TI1
RM0453
and Figure 32.
MS33434V1
MS33435V1