Internal Clock Source Characteristics; Figure 18. Typical Application With A 32.768 Khz Crystal - STMicroelectronics STM32F042F4 Manual

Electrical characteristics
Note: For information on selecting the crystal, refer to the application note AN2867 "Oscillator
design guide for ST microcontrollers" available from the ST website www.st.com.
Note: An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden
to add one.
6.3.8

Internal clock source characteristics

The parameters given in
temperature and supply voltage conditions summarized in
conditions. The provided curves are characterization results, not tested in production.
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Figure 18. Typical application with a 32.768 kHz crystal

are derived from tests performed under ambient
Table 38
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STM32F042x4 STM32F042x6
Table 21: General operating