```
v1
    f1 f2 f4 l1
USART:sci2_v1_1_Cube: F1
USART:sci2_v1_2_F1_Cube: F1
USART:sci2_v1_2_Cube: F2, F4, L1

v2: completely redesigned
    f0 f3 f7 l0 l4 
USART:sci2_v2_0_Cube: F0, F3
USART:sci2_v2_1_Cube: F3
USART:sci2_v2_2_Cube: F0
USART:sci3_v1_0_Cube: F0
USART:sci3_v1_1_Cube: F7, L0, L4

v3: like v2, but added PRESC
    g0 g4 h7 l5 wb wl
USART:sci3_v1_2_Cube: L4+
USART:sci3_v2_0_Cube: H7, L5
USART:sci3_v2_1_Cube: G0, G4, WB, WL