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What's difference between these several register?

Question asked by fairchild.brian on Sep 15, 2013
Latest reply on Sep 28, 2013 by Clive One
Hi everybody
i have three primary questions.
1- What's difference between GPIOx_CRL rigester and GPIOx_CRH rigester?
B.T.W: yeah, i know these both configure the GPIO to input or output modes and speed of output mode but i can't to know another Differences!
2- What's difference between those two above rigester and GPIOx_BSRR or GPIOx_BRR?
3- What's difference between GPIOx_BSRR and GPIOx_BRR?

Yes, i know these questions is very primary but i can find any info about these cases.