MODER
OTYPER
GPIO port output type register, Address offset: 0x04.
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OSPEEDR
GPIO port output speed register, Address offset: 0x08.
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PUPDR
GPIO port pull-up/pull-down register, Address offset: 0x0C.
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IDR
GPIO port input data register, Address offset: 0x10.
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ODR
GPIO port output data register, Address offset: 0x14.
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BSRR
GPIO port bit set/reset register, Address offset: 0x18.
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LCKR
GPIO port configuration lock register, Address offset: 0x1C.
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AFR
GPIO alternate function registers, Address offset: 0x20-0x24.
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