ST STM32L4x6 Reference Manual page 270

General-purpose I/Os (GPIO)
31 30 29
Res. Res. Res.
15 14 13
ASC15 ASC14 ASC13 ASC12
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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.
270/1693
28 27 26 25
Res. Res. Res. Res.
12 11 10 9
ASC11 ASC10 ASC9
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0: Disconnect analog switch to the ADC input (reset state)
1: Connect analog switch to the ADC input
Only the IO which connected to the ADC input are effective. Other IO must be kept
reset value
24 23 22
Res. Res. Res.
8 7 6
ASC8 ASC7 ASC6
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DocID024597 Rev 3
21 20 19 18
Res. Res. Res. Res.
5 4 3 2
ASC5 ASC4 ASC3 ASC2
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RM0351
17 16
Res. Res.
1 0
ASC1 ASC0
rw rw