ST STM32L4 5 Series Reference Manual page 306

General-purpose I/Os (GPIO)
31 30 29
Res. Res. Res.
15 14 13
ASC15 ASC14 ASC13 ASC12
rw rw rw
Bits 31:16 Reserved
Bits 15:0 ASCy: Port x analog switch control y (y= 0..15)
These bits are written by software to configure the analog connection of the IOs
Note: This bis must be set prior to the ADC conversion.
a. (this register only applicable for STM32L475xx/476xx/486xx devices)
306/1830
28 27 26 25
Res. Res. Res. Res.
12 11 10 9
ASC11 ASC10 ASC9
rw rw rw rw
0: Disconnect analog switch to the ADC input (reset state)
1: Connect analog switch to the ADC input
Only the IO which connect to the ADC input are effective. Other IOs must keep their
reset value
24 23 22
Res. Res. Res.
8 7 6
ASC8 ASC7 ASC6
rw rw rw
DocID024597 Rev 5
21 20 19 18
Res. Res. Res. Res.
5 4 3 2
ASC5 ASC4 ASC3 ASC2
rw rw rw rw
RM0351
17 16
Res. Res.
1 0
ASC1 ASC0
rw rw