ATMega chip full datasheet - UCSD Department of Physics

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ATmega48A/PA/88A/PA/168A/PA/328/P20.5 USART InitializationThe USART has to be initialized before any communication can take place. The initialization processnormally consists <strong>of</strong> setting the baud rate, setting frame format and enabling theTransmitter or the Receiver depending on the usage. For interrupt driven USART operation, theGlobal Interrupt Flag should be cleared (and interrupts globally disabled) when doing theinitialization.Before doing a re-initialization with changed baud rate or frame format, be sure that there are noongoing transmissions during the period the registers are changed. The TXCn Flag can be usedto check that the Transmitter has completed all transfers, and the RXC Flag can be used tocheck that there are no unread data in the receive buffer. Note that the TXCn Flag must becleared before each transmission (before UDRn is written) if it is used for this purpose.The following simple USART initialization code examples show one assembly and one C functionthat are equal in functionality. The examples assume asynchronous operation using polling(no interrupts enabled) and a fixed frame format. The baud rate is given as a function parameter.For the assembly code, the baud rate parameter is assumed to be stored in the r17:r16Registers.8271D–AVR–05/11184
ATmega48A/PA/88A/PA/168A/PA/328/PAssembly Code Example (1)USART_Init:; Set baud rateout UBRRnH, r17out UBRRnL, r16; Enable receiver and transmitterldi r16, (1
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Atmel Corporation2325 Orchard Parkw
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ATMega chip full datasheet - UCSD Department of Physics

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