ATmega16A microcontroller UBRRH and UCSRC description-EEWORLD

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Introduction: There is one thing to note about the ATMEGA16 serial port. The UBRRH and UCSRC registers use the same IO address, so be careful when setting and reading.

The UCSRC and UBRRH registers of the microcontroller UART share the same address, and the highest bit URSEL is used to select which data to update. For example: if you write UCSRC=0x86, then the highest bit Bit7 of 0x86=1, so this set of data will update the value of UCSRC; if you write UBRRH=0x01, then the highest bit Bit7 of 0x01=0, so this set of data will update the value of UBRRH without specifically updating the value of URSEL. If you write UBRRH=0x81, then the value of UCSRC will be updated, which is automatically recognized. I saw a friend asking online: Why didn't you set URSEL to 0 when writing UBRRH in the program? Instead, you directly set UBRRH=BAUD_H;UBRRL=BAUD_L; Now everyone should understand that as long as the highest bit of BUAD_H written is 0, that is, AUD_H&0x80==0, the value of UBRRH will be automatically updated without the need to specifically set the value of URSEL.

Below I give the serial port initialization code I use, which is very easy to understand. Combined with the text above, the initial code sets the baud rate to 115200. My microcontroller crystal oscillator is 16MHZ. The value of UBRR can be found in the AVR manual.

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