Gpio Alternate Function Low Register (Gpiox_Afrl) (X = A; (X = A - STMicroelectronics STM32F05 series Reference Manual

General-purpose I/Os (GPIO)
8.4.9 GPIO alternate function low register (GPIOx_AFRL) (x = A..B)
Address offset: 0x20
Reset value: 0x0000 0000
31 30 29
AFRL7[3:0]
rw rw rw
15 14 13
AFRL3[3:0]
rw rw rw
Bits 31:0 AFRLy: Alternate function selection for port x pin y (y = 0..7)
8.4.10 GPIO alternate function high register (GPIOx_AFRH)
(x = A..B)
Address offset: 0x24
Reset value: 0x0000 0000
31 30 29
AFRH15[3:0]
rw rw rw
15 14 13
AFRH11[3:0]
rw rw rw
Bits 31:0 AFRHy: Alternate function selection for port x pin y (y = 8..15)
These bits are written by software to configure alternate function I/Os
AFRHy selection:
0000: AF0
0001: AF1
0010: AF2
0011: AF3
0100: AF4 (Port A only)
0101: AF5 (Port A only)
0110: AF6 (Port A only)
0111: AF7 (Port A only)
132/742
28 27 26 25
AFRL6[3:0]
rw rw rw rw
12 11 10 9
AFRL2[3:0]
rw rw rw rw
These bits are written by software to configure alternate function I/Os
AFRLy selection:
0000: AF0
0001: AF1
0010: AF2
0011: AF3
0100: AF4 (Port A only)
0101: AF5 (Port A only)
0110: AF6 (Port A only)
0111: AF7 (Port A only)
28 27 26 25
AFRH14[3:0]
rw rw rw rw
12 11 10 9
AFRH10[3:0]
rw rw rw rw
Doc ID 018940 Rev 1
24 23 22 21
AFRL5[3:0]
rw rw rw rw
8 7 6 5
AFRL1[3:0]
rw rw rw rw
1000: Reserved
1001: Reserved
1010: Reserved
1011: Reserved
1100: Reserved
1101: Reserved
1110: Reserved
1111: Reserved
24 23 22 21
AFRH13[3:0]
rw rw rw rw
8 7 6 5
AFRH9[3:0]
rw rw rw rw
1000: Reserved
1001: Reserved
1010: Reserved
1011: Reserved
1100: Reserved
1101: Reserved
1110: Reserved
1111: Reserved
RM0091
20 19 18 17
AFRL4[3:0]
rw rw rw rw
4 3 2 1
AFRL0[3:0]
rw rw rw rw
20 19 18 17
AFRH12[3:0]
rw rw rw rw
4 3 2 1
AFRH8[3:0]
rw rw rw rw
16
rw
0
rw
16
rw
0
rw