General-purpose I/Os (GPIO) RM0090
199/1422 Doc ID 018909 Rev 4
7.4.2 GPIO port output type register (GPIOx_OTYPER)
(x = A..I)
Address offset: 0x04
Reset value: 0x0000 0000
7.4.3 GPIO port output speed register (GPIOx_OSPEEDR)
(x = A..I/)
Address offset: 0x08
Reset values:
● 0x0000 00C0 for port B
● 0x0000 0000 for other ports
7.4.4 GPIO port pull-up/pull-down register (GPIOx_PUPDR)
(x = A..I/)
Address offset: 0x0C
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved
1514131211109876543210
OT15 OT14 OT13 OT12 OT11 OT10 OT9 OT8 OT7 OT6 OT5 OT4 OT3 OT2 OT1 OT0
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:16 Reserved, must be kept at reset value.
Bits 15:0 OTy[1:0]: Port x configuration bits (y = 0..15)
These bits are written by software to configure the output type of the I/O port.
0: Output push-pull (reset state)
1: Output open-drain
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:2y+1 OSPEEDRy[1:0]: Port x configuration bits (y = 0..15)
These bits are written by software to configure the I/O output speed.
00: 2 MHz Low speed
01: 25 MHz Medium speed
10: 50 MHz Fast speed
11: 100 MHz High speed on 30 pF (80 MHz Output max speed on 15 pF)
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