FT20=B_0x0, FT21=B_0x0
EXTI falling trigger selection register
| FT0 | Falling trigger event configuration bit of configurable event input x |
| FT1 | Falling trigger event configuration bit of configurable event input x |
| FT2 | Falling trigger event configuration bit of configurable event input x |
| FT3 | Falling trigger event configuration bit of configurable event input x |
| FT4 | Falling trigger event configuration bit of configurable event input x |
| FT5 | Falling trigger event configuration bit of configurable event input x |
| FT6 | Falling trigger event configuration bit of configurable event input x |
| FT7 | Falling trigger event configuration bit of configurable event input x |
| FT8 | Falling trigger event configuration bit of configurable event input x |
| FT9 | Falling trigger event configuration bit of configurable event input x |
| FT10 | Falling trigger event configuration bit of configurable event input x |
| FT11 | Falling trigger event configuration bit of configurable event input x |
| FT12 | Falling trigger event configuration bit of configurable event input x |
| FT13 | Falling trigger event configuration bit of configurable event input x |
| FT14 | Falling trigger event configuration bit of configurable event input x |
| FT15 | Falling trigger event configuration bit of configurable event input x |
| FT20 | Falling trigger event configuration bit of configurable event input x 0 (B_0x0): Falling trigger disabled (for event and interrupt) for input line 1 (B_0x1): Falling trigger enabled (for event and interrupt) for input line. |
| FT21 | Falling trigger event configuration bit of configurable event input x 0 (B_0x0): Falling trigger disabled (for event and interrupt) for input line 1 (B_0x1): Falling trigger enabled (for event and interrupt) for input line. |