General-purpose I/Os (GPIO) RM0453
416/1461 RM0453 Rev 1
10.4.20 GPIOC alternate function low register (GPIOC_AFRL)
Address offset: 0x0820
Reset value: 0x0000 0000
Bit 2 LCK2: Port PC2 lock configuration
Bit 1 LCK1: Port PC1 lock configuration
Bit 0 LCK0: Port PC0 lock configuration
This bit is read/write but can only be written when the LCKK bit is 0.
0: Port PC0 configuration not locked
1: Port PC0 configuration locked
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
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