General-purpose I/Os (GPIO) RM0091
128/742 Doc ID 018940 Rev 1
8.4.3 GPIO port output speed register (GPIOx_OSPEEDR)
(x = A..D, F)
Address offset: 0x08
Reset value: 0x0000 0000
8.4.4 GPIO port pull-up/pull-down register (GPIOx_PUPDR)
(x = A..D, F)
Address offset: 0x0C
Reset values:
● 0x2400 0000 for port A
● 0x0000 0000 for other ports
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
OSPEEDR15[1:0] OSPEEDR14[1:0] OSPEEDR13[1:0] OSPEEDR12[1:0] OSPEEDR11[1:0] OSPEEDR10[1:0] OSPEEDR9[1:0] OSPEEDR8[1:0]
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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
OSPEEDR7[1:0] OSPEEDR6[1:0] OSPEEDR5[1:0] OSPEEDR4[1:0] OSPEEDR3[1:0] OSPEEDR2[1:0] OSPEEDR1[1:0] OSPEEDR0[1:0]
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Bits 2y+1:2y OSPEEDRy[1:0]: Port x configuration bits (y = 0..15)
These bits are written by software to configure the I/O output speed.
x0: 2 MHz Low speed
01: 10 MHz Medium speed
11: 50 MHz High speed
Note: Refer to the device datasheet for the frequency specifications and the power
supply and load conditions for each speed.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
PUPDR15[1:0] PUPDR14[1:0] PUPDR13[1:0] PUPDR12[1:0] PUPDR11[1:0] PUPDR10[1:0] PUPDR9[1:0] PUPDR8[1:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
PUPDR7[1:0] PUPDR6[1:0] PUPDR5[1:0] PUPDR4[1:0] PUPDR3[1:0] PUPDR2[1:0] PUPDR1[1:0] PUPDR0[1:0]
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Bits 2y+1:2y PUPDRy[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
00: No pull-up, pull-down
01: Pull-up
10: Pull-down
11: Reserved
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