Datasheet

ATmega48/88/168 Automotive [DATASHEET]
7530K–AVR–07/14
146
17. USART0
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
The USART can also be used in master SPI mode, see Section 18. “USART in SPI Mode” on page 168. The power
reduction USART bit, PRUSART0, in Section 7.7.1 “Power Reduction Register - PRR” on page 35 must be disabled by
writing a logical zero to it.