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[SOLVED] Lay man question on AVR serial communication.

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ark5230

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Two simple queries

  1. Is there something like serial data buffer in AVR microcontrollers Atmega 16/32?
  2. If serial input is coming to MCU, the incoming data will not be accessible after the data stream is over?
 

UDR is the register which holds the serial byte. You have to use Serial receive interrupt to read the bytes. If the serial transmission is complete then UDR holds the last byte that was transmitted to AVR.
 
Thanks
UDR holds the latest byte received.
 

Hi,

THE given answer is true. It , relates on UART communication.
There are at least two other serial communication interfaces: SPI and TWI.

In either case you need to read the receive register before a new byte tranfer is complete, else you will loose data.

Klaus
 
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