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CCS/CC1200EMK-420-470: GPIO2 pin Configuration

Part Number: CC1200EMK-420-470
Other Parts Discussed in Thread: MSP430G2553

Tool/software: Code Composer Studio


I am using CC1200EM for data transmission. In Smart RF Studio, the register export creates a register named 

CC120X_IOCFG2    0x06;

This register configures the GPIO2 on the EM. 

What is the role of GPIO2 in the data transmission as in the user's guide, it is mentioned that the micro-controller interface is with 4 wire SPI?