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MMC1_CMD Configuration

 

In a requirement MMC1_CMD pin of the processor OMAP 3530 is being used as Chip Select for one of the devices connected which is a 1.8V device.But when this pin is configured as a GPIO it is toggling but the voltage level is 3.0V. 

My doubt is How to configure the of MMC1_CMD to output a voltage of 1.8v instead of 3.0v?What are the registers to be configured for the same?