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How printf work ?

Hello, I'm using DELFINO DUAL,

I see some example use the printf("message")

that allow processor to send "message" to the CCS

where you can see in the output window.

My question is:

How printf work ?

I think there is a particular register in the MCU

where printf puts the character to send to the emulator

and CCS polling emulator in order to read this characters.

If I want to write my own super light-weight printf I want to know where to write data. 

Thankyou in advice.