General-purpose I/Os (GPIO) RM0351
264/1693 DocID024597 Rev 3
7.4 GPIO registers
This section gives a detailed description of the GPIO registers.
For a summary of register bits, register address offsets and reset values, refer to Table 33.
The peripheral registers can be written in word, half word or byte mode.
7.4.1 GPIO port mode register (GPIOx_MODER) (x =A..H)
Address offset:0x00
Reset values:
• 0xABFF FFFF for port A
• 0xFFFF FEBF for port B
• 0xFFFF FFFF for ports C..G,
• 0x0000 000F for port H
7.4.2 GPIO port output type register (GPIOx_OTYPER) (x = A..H)
Address offset: 0x04
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
MODE15[1:0] MODE14[1:0] MODE13[1:0] MODE12[1:0] MODE11[1:0] MODE10[1:0] MODE9[1:0] MODE8[1:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
MODE7[1:0] MODE6[1:0] MODE5[1:0] MODE4[1:0] MODE3[1:0] MODE2[1:0] MODE1[1:0] MODE0[1:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 2y+1:2y MODEy[1:0]: Port x configuration bits (y = 0..15)
These bits are written by software to configure the I/O mode.
00: Input mode
01: General purpose output mode
10: Alternate function mode
11: Analog mode (reset state)
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
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: Port x configuration bits (y = 0..15)
These bits are written by software to configure the I/O output type.
0: Output push-pull (reset state)
1: Output open-drain
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