Chapter 39
Universal Asynchronous Receiver/Transmitter
(UART0)
39.1 Introduction
39.1.1 Features
Features of the UART module include:
• Full-duplex, standard non-return-to-zero (NRZ) format
• Double-buffered transmitter and receiver with separate enables
• Programmable baud rates (13-bit modulo divider)
• Transmit and receive baud rate can operate asynchronous to the bus clock:
• Baud rate can be configured independently of the bus clock frequency
• Supports operation in Stop modes
• Configurable receiver buad rate oversampling ratio from 4x to 32x
• Interrupt, DMA or polled operation:
• Transmit data register empty and transmission complete
• Receive data register full
• Receive overrun, parity error, framing error, and noise error
• Idle receiver detect
• Active edge on receive pin
• Break detect supporting LIN
• Hardware parity generation and checking
• Programmable 8-bit, 9-bit or 10-bit character length
• Programmable 1-bit or 2-bit stop bits
• Receiver wakeup by idle-line, address-mark or address match
• Optional 13-bit break character generation / 11-bit break character detection
• Selectable transmitter output and receiver input polarity
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 721
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