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ATmega8515(L)
2512K–AVR–01/10
USART
The Universal Synchronous and Asynchronous serial Receiver and Transmitter
(USART) is a highly flexible serial communication device. The main features 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 functionality for the USART is described below.
Note that in AT90S4414/8515 compatibility mode, the double buffering of the USART
Receive Register is disabled. For details, see “AVR USART vs. AVR UART – Compati-
bility” on page 137.
A simplified block diagram of the USART Transmitter is shown in Figure 64. CPU acces-
sible I/O Registers and I/O pins are shown in bold.
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