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RM0090 General-purpose I/Os (GPIO)
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8.4 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 Tabl e 39.
The GPIO registers can be accessed by byte (8 bits), half-words (16 bits) or words (32 bits).
8.4.1 GPIO port mode register (GPIOx_MODER) (x = A..I/J/K)
Address offset: 0x00
Reset values:
• 0xA800 0000 for port A
• 0x0000 0280 for port B
• 0x0000 0000 for other ports
8.4.2 GPIO port output type register (GPIOx_OTYPER)
(x = A..I/J/K)
Address offset: 0x04
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
MODER15[1:0] MODER14[1:0] MODER13[1:0] MODER12[1:0] MODER11[1:0] MODER10[1:0] MODER9[1:0] MODER8[1:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
MODER7[1:0] MODER6[1:0] MODER5[1:0] MODER4[1:0] MODER3[1:0] MODER2[1:0] MODER1[1:0] MODER0[1:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 2y:2y+1 MODERy[1:0]: Port x configuration bits (y = 0..15)
These bits are written by software to configure the I/O direction mode.
00: Input (reset state)
01: General purpose output mode
10: Alternate function mode
11: Analog mode
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: 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
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