ST STM32F40 Series User Manual

General-purpose I/Os (GPIO) RM0090
203/1422 Doc ID 018909 Rev 4
7.4.10 GPIO alternate function high register (GPIOx_AFRH)
(x = A..I)
Address offset: 0x24
Reset value: 0x0000 0000
7.4.11 GPIO register map
The following table gives the GPIO register map and the reset values.
Bits 31:0 AFRLy: Alternate function selection for port x bit y (y = 0..7)
These bits are written by software to configure alternate function I/Os
AFRLy 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
AFRH15[3:0] AFRH14[3:0] AFRH13[3:0] AFRH12[3:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
AFRH11[3:0] AFRH10[3:0] AFRH9[3:0] AFRH8[3:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:0 AFRHy: Alternate function selection for port x bit 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
0101: AF5
0110: AF6
0111: AF7
1000: AF8
1001: AF9
1010: AF10
1011: AF11
1100: AF12
1101: AF13
1110: AF14
1111: AF15
Table 32. GPIO register map and reset values
Offset Register
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9 8 7 6 5 4 3 2 1 0
0x00
GPIOA_MODER
MODER15[1:0] MODER14[1:0] MODER13[1:0] MODER12[1:0] MODER11[1:0] MODER10[1:0]
MODER9[1:0] MODER8[1:0] MODER7[1:0] MODER6[1:0] MODER5[1:0] MODER4[1:0] MODER3[1:0] MODER2[1:0] MODER1[1:0] MODER0[1:0]
Reset value 10101000000000000000000000000000

ST STM32F40 Series Specifications

General

Brand	ST
Model	STM32F40 Series
Category	Microcontrollers
Language	English