ST STM32L0x3 User Manual

RM0367 Rev 7 251/1043
RM0367 General-purpose I/Os (GPIO)
254
9.4.9 GPIO alternate function low register (GPIOx_AFRL)
(x = A to E and H)
Address offset: 0x20
Reset value: 0x0000 0000
9.4.10 GPIO alternate function high register (GPIOx_AFRH)
(x = A to E and H)
Address offset: 0x24
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
AFSEL7[3:0] AFSEL6[3:0] AFSEL5[3:0] AFSEL4[3:0]
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1514131211109876543210
AFSEL3[3:0] AFSEL2[3:0] AFSEL1[3:0] AFSEL0[3:0]
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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
Others: Reserved
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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ST STM32L0x3 Specifications

General

Brand	ST
Model	STM32L0x3
Category	Microcontrollers
Language	English