RM0453 Rev 5 421/1450
RM0453 General-purpose I/Os (GPIO)
431
10.4.20 GPIOC alternate function low register (GPIOC_AFRL)
Address offset: 0x0820
Reset value: 0x0000 0000
10.4.21 GPIOC alternate function high register (GPIOC_AFRH)
Address offset: 0x0824
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. AFSEL6[3:0] AFSEL5[3:0] AFSEL4[3:0]
rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
AFSEL3[3:0] AFSEL2[3:0] AFSEL1[3:0] AFSEL0[3:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:28 Reserved, must be kept at reset value.
Bits 27:24 AFSEL6[3:0]: Port PC6 alternate function selection
Bits 23:20 AFSEL5[3:0]: Port PC5 alternate function selection
Bits 19:16 AFSEL4[3:0]: Port PC4 alternate function selection
Bits 15:12 AFSEL3[3:0]: Port PC3 alternate function selection
Bits 11:8 AFSEL2[3:0]: Port PC2 alternate function selection
Bits 7:4 AFSEL1[3:0]: Port PC1 alternate function selection
Bits 3:0 AFSEL0[3:0]: Port PC0 alternate function selection
These bits are written by software to configure alternate function I/Os.
0x0: AF0 selected
0x1: AF1 selected
0x2: AF2 selected
...
0xE: AF14 selected
0xF: AF15 selected
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
AFSEL15[3:0] AFSEL14[3:0] AFSEL13[3:0] Res. Res. Res. Res.
rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
Bits 31:28 AFSEL15[3:0]: Port PC15 alternate function selection
Bits 27:24 AFSEL14[3:0]: Port PC14 alternate function selection
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