A96G150 User's manual
15. Combination of USART, SPI, and I2C (USI)
177
15.1
USIn UART mode
Universal synchronous and asynchronous serial receiver and transmitter (USART) are highly flexible
serial communication devices. Main features are listed below:
Full Duplex Operation (Independent Serial Receive and Transmit Registers)
Asynchronous or Synchronous Operation
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 are Supported by Hardware
Data OverRun Detection
Framing Error Detection
Three Separate Interrupts on TX Completion, TX Data Register Empty and RX Completion
Double Speed Asynchronous communication mode
The USIn comprises clock generator, transmitter and receiver. Clock generation logic consists of
synchronization logic for external clock input used by synchronizing or SPI slave operation, and the
baud rate generator for asynchronous or master (synchronous or SPI) operation.
Transmitter consists of a single write buffer, a serial shift register, parity generator and control logic for
handling different serial frame formats. A write buffer allows continuous transfer of data without any
delay between frames.
Receiver is the most complex part of the UART module due to its clock and data recovery units. The
recovery unit is used for asynchronous data reception. In addition to the recovery unit, the receiver
includes a parity checker, a shift register, a two-level receive FIFO (USInDR) and control logic. The
receiver supports the same frame formats as the transmitter and can detect frame error, data overrun
and parity errors.
Содержание A96G150
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