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manually switch a register inside SPI handle

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Hello, In my efm32lg I need to set my routing regystry in CSPEN to be zero, i try to write a code for manualy put zero inside cell 2 as shown in the
manual printscreen bellow.
//x3x2x1x0
//0 1 0 0 shifted 1 by two places
//1 0 1 1 inverted shifted one
//x3 0 x1 x0 inverted shifted one
Code:
USART2->ROUTE=(USART2->ROUTE)&(~(1<<2));
Is this a valid way to change a value in a register?I am not sure if it will affect the handle
maybe i should do i like this...

manually switch a register inside SPI handle

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