Rainbow-electronics ATmega8515L Manuel d'utilisateur télécharger pdf (Page 131)

131

ATmega8515(L)

2512A–AVR–04/02

USART The UniversalSynchronous and Asynchronousserial Receiver and Transmitter

(USART) is a highly flexible serialcommunication device. Themainfeatures are:

•

Full Duplex Operation (Independent Serial Receive and Transmit Registers)

• Asynchronous or Synchronous Operation

• Master or Slave Clocked Synchronous Operation

• High Resolution Baud Rate Generator

• Supports Serial Frames with 5, 6, 7, 8, or 9 Data Bits and 1 or 2 Stop Bits

• Odd or Even Parity Generation and Parity Check Supported by Hardware

• Data OverRun Detection

• Framing Error Detection

• Noise Filtering Includes False Start Bit Detection and Digital Low Pass Filter

• Three Separate Interrupts on TX Complete, TX Data Register Empty, and RX Complete

• Multi-processor Communication Mode

• Double Speed Asynchronous Communication Mode

Single USART The ATmega8515 has one USART. The functionalityfor the USART isdescribedbelow.

Note that in AT90S4414/8515 compatibility mode, the double buffering of the USART

receive register isdisabled. Fordetails, see “AVR USART vs. AVR UART – Compatibil-

ity”onpage 133.

A simplifiedblock diagram of the USART transmitter isshowninFigure 63. CPU acces-

sible I/Oregisters andI/Opins are showninbold.

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Rainbow-electronics ATmega8515L Manuel d'utilisateur Page 131