RM0440 Rev 4 365/2126
RM0440 General-purpose I/Os (GPIO)
368
9.4.10 GPIO alternate function high register (GPIOx_AFRH)
(x = A to G)
Address offset: 0x24
Reset value: 0x0000 0000
Bits 31:0 AFSEL[7:0][3:0]: Alternate function selection for port x I/O pin y (y = 7 to 0)
These bits are written by software to configure alternate function I/Os.
0000: AF0
0001: AF1
0010: AF2
0011: AF3
0100: AF4
0101: AF5
0110: AF6
0111: AF7
1000: AF8
1001: AF9
1010: AF10
1011: AF11
1100: AF12
1101: AF13
1110: AF14
1111: AF15
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] AFSEL12[3:0]
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1514131211109876543210
AFSEL11[3:0] AFSEL10[3:0] AFSEL9[3:0] AFSEL8[3:0]
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