STM32F051R4 - timer capture input value when not selected as an input

[semler]

I have question about value of the TIM2_CH1 and TIM2_CH2 if they are not selected by any pin in AFR registers. Is there "default connection" or they are left floating or they are grounded?

I need to know this as I cannot use these two inputs on any pin. Only I can use TIM2_CH3. I want to use this input along with XOR function to triggering (by using TI1S bit in CR2 register).

[waclawek.jan]

This unfortunately was never confirmed by ST, but it appears that AF which are not assigned to any pin in GPIO are solid 0.

JW