ST STM32L4x6 Reference Manual page 265

RM0351
7.4.3 GPIO port output speed register (GPIOx_OSPEEDR)
(x = A..H)
Address offset: 0x08
Reset value:
•
0x0C00 0000 for port A
• 0x0000 0000 for the other ports
31 30 29
OSPEED15 OSPEED14
[1:0] [1:0]
rw rw rw
15 14 13
OSPEED7 OSPEED6
[1:0] [1:0]
rw rw rw
Bits 2y+1:2y OSPEEDy[1:0]: Port x configuration bits (y = 0..15)
These bits are written by software to configure the I/O output speed.
Note: Refer to the device datasheet for the frequency specifications and the power supply
7.4.4 GPIO port pull-up/pull-down register (GPIOx_PUPDR)
(x = A..H)
Address offset: 0x0C
Reset values:
•
0x1210 0000 for port A
•
0x6400 0000 for port B
•
0x0000 0000 for other ports
31 30 29 28
PUPD15[1:0] PUPD14[1:0]
rw rw rw rw
15 14 13 12
PUPD7[1:0] PUPD6[1:0]
rw rw rw rw
Bits 2y+1:2y PUPDy[1:0]: Port x configuration bits (y = 0..15)
These bits are written by software to configure the I/O pull-up or pull-down
28 27 26 25
OSPEED13 OSPEED12
[1:0]
rw rw rw rw
12 11 10 9
OSPEED5 OSPEED4
[1:0]
rw rw rw rw
00: Low speed
01: Medium speed
10: High speed
11: Very high speed
and load conditions for each speed.
27 26 25
PUPD13[1:0] PUPD12[1:0]
rw rw rw
11 10 9
PUPD5[1:0] PUPD4[1:0]
rw rw rw
00: No pull-up, pull-down
01: Pull-up
10: Pull-down
11: Reserved
DocID024597 Rev 3
24 23 22
OSPEED11
[1:0] [1:0]
rw rw rw
8 7 6
OSPEED3
[1:0] [1:0]
rw rw rw
24 23 22
PUPD11[1:0]
rw rw rw
8 7 6
PUPD3[1:0]
rw rw rw
General-purpose I/Os (GPIO)
21 20 19 18
OSPEED10 OSPEED9
[1:0] [1:0]
rw rw rw rw
5 4 3
OSPEED2 OSPEED1
[1:0] [1:0]
rw rw rw rw
21 20 19 18
PUPD10[1:0] PUPD9[1:0]
rw rw rw rw
5 4 3 2
PUPD2[1:0] PUPD1[1:0]
rw rw rw rw
17 16
OSPEED8
[1:0]
rw rw
2 1 0
OSPEED0
[1:0]
rw rw
17 16
PUPD8[1:0]
rw rw
1 0
PUPD0[1:0]
rw rw
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