General-purpose I/Os (GPIO) RM0453
404/1461 RM0453 Rev 1
10.4.4 GPIOx pull-up/pull-down register (GPIOx_PUPDR) (x = A to B)
Address offset: Block A: 0x000C
Address offset: Block B: 0x040C
Reset value: Block A: 0x6400 0000
Reset value: Block B: 0x0000 0100
Bits 31:30 OSPEED15[1:0]: Port Px15 output speed configuration
Bits 29:28 OSPEED14[1:0]: Port Px14 output speed configuration
Bits 27:26 OSPEED13[1:0]: Port Px13 output speed configuration
Bits 25:24 OSPEED12[1:0]: Port Px12 output speed configuration
Bits 23:22 OSPEED11[1:0]: Port Px11 output speed configuration
Bits 21:20 OSPEED10[1:0]: Port Px10 output speed configuration
Bits 19:18 OSPEED9[1:0]: Port Px9 output speed configuration
Bits 17:16 OSPEED8[1:0]: Port Px8 output speed configuration
Bits 15:14 OSPEED7[1:0]: Port Px7 output speed configuration
Bits 13:12 OSPEED6[1:0]: Port Px6 output speed configuration
Bits 11:10 OSPEED5[1:0]: Port Px5 output speed configuration
Bits 9:8 OSPEED4[1:0]: Port Px4 output speed configuration
Bits 7:6 OSPEED3[1:0]: Port Px3 output speed configuration
Bits 5:4 OSPEED2[1:0]: Port Px2 output speed configuration
Bits 3:2 OSPEED1[1:0]: Port Px1 output speed configuration
Bits 1:0 OSPEED0[1:0]: Port Px0 output speed configuration
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.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
PUPD15[1:0] PUPD14[1:0] PUPD13[1:0] PUPD12[1:0] PUPD11[1:0] PUPD10[1:0] PUPD9[1:0] PUPD8[1:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
PUPD7[1:0] PUPD6[1:0] PUPD5[1:0] PUPD4[1:0] PUPD3[1:0] PUPD2[1:0] PUPD1[1:0] PUPD0[1:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:30 PUPD15[1:0]: Port Px15 pull configuration
Bits 29:28 PUPD14[1:0]: Port Px14 pull configuration
Bits 27:26 PUPD13[1:0]: Port Px13 pull configuration
Bits 25:24 PUPD12[1:0]: Port Px12 pull configuration
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