DocID024597 Rev 3 269/1693
RM0351 General-purpose I/Os (GPIO)
272
7.4.10 GPIO alternate function high register (GPIOx_AFRH)
(x = A..H)
Address offset: 0x24
Reset value: 0x0000 0000
7.4.11 GPIO port bit reset register (GPIOx_BRR) (x =A..H)
Address offset: 0x28
Reset value: 0x0000 0000
7.4.12 GPIO port analog switch control register (GPIOx_ASCR)(x = A..H)
Address offset: 0x2C
Reset value: 0x0000 0000
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]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
AFSEL11[3:0] AFSEL10[3:0] AFSEL9[3:0] AFSEL8[3:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:0 AFSELy[3:0]: Alternate function selection for port x pin y (y = 8..15)
These bits are written by software to configure alternate function I/Os
AFSELy selection:
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
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
BR15 BR14 BR13 BR12 BR11 BR10 BR9 BR8 BR7 BR6 BR5 BR4 BR3 BR2 BR1 BR0
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Bits 31:16 Reserved
Bits 15:0 BRy: Port x Reset bit y (y= 0..15)
These bits are write-only. A read to these bits returns the value 0x0000
0: No action on the corresponding ODx bit
1: Reset the corresponding ODx bit
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