Rainbow Electronics ATmega163L - Manual (Page 60)

ATmega163(L)
60
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: