General-purpose I/Os (GPIO) RM0453
410/1450 RM0453 Rev 5
10.4.2 GPIOx output type register (GPIOx_OTYPER) (x = A to B)
Address offset: Block A: 0x0004
Address offset: Block B: 0x0404
Reset value: 0x0000 0000
10.4.3 GPIOx output speed register (GPIOx_OSPEEDR) (x = A to B)
Address offset: Block A: 0x0008
Address offset: Block B: 0x0408
Reset value: Block A: 0x0C00 0000
Reset value: Block B: 0x0000 00C0
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
OT15 OT14 OT13 OT12 OT11 OT10 OT9 OT8 OT7 OT6 OT5 OT4 OT3 OT2 OT1 OT0
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Bits 31:16 Reserved, must be kept at reset value.
Bits 15:0 OTy: Port Pxy output type configuration (y = 15 to 0)
These bits are written by software to configure the I/O output type.
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
OSPEED15[1:0] OSPEED14[1:0] OSPEED13[1:0] OSPEED12[1:0] OSPEED11[1:0] OSPEED10[1:0] OSPEED9[1:0] OSPEED8[1:0]
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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
OSPEED7[1:0] OSPEED6[1:0] OSPEED5[1:0] OSPEED4[1:0] OSPEED3[1:0] OSPEED2[1:0] OSPEED1[1:0] OSPEED0[1:0]
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Bits 31:0 OSPEEDy[1:0]: Port Pxy output speed configuration (y = 15 to 0)
These bits are written by software to configure the I/O output speed.
00: Low speed
01: Medium speed
10: Fast speed
11: High speed
Note: Refer to the device datasheet for the frequency specifications and the power supply
and load conditions for each speed.
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