Instruction Manual

ATmega163(L)

UART

The ATmega163 features a full duplex (separate receive and transmit registers) Universal Asynchronous Receiver and

Transmitter (UART). The main features are:

•

Baud Rate Generator Generates any Baud Rate

• High Baud Rates at Low XTAL Frequencies

• 8 or 9 Bits Data

• Noise Filtering

• Overrun Detection

• Framing Error Detection

• False Start Bit Detection

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

• Multi-processor Communication Mode

• Double Speed UART Mode

Data Transmission

A block schematic of the UART transmitter is shown in Figure 45.

Figure 45. UART Transmitter

Data transmission is initiated by writing the data to be transmitted to the UART I/O Data Register, UDR. Data is transferred

from UDR to the Transmit shift register when: