Information

Chapter 45
Universal Asynchronous Receiver/Transmitter
(UART)
45.1 Introduction
NOTE
For the chip-specific implementation details of this module's
instances see the chip configuration chapter.
The UART allows asynchronous serial communication with peripheral devices and
CPUs.
45.1.1 Features
The UART includes the following features:
• Full-duplex operation
• Standard mark/space non-return-to-zero (NRZ) format
• Selectable IrDA 1.4 return-to-zero-inverted (RZI) format with programmable pulse
width
• 13-bit baud rate selection with /32 fractional divide, based on the module clock
frequency
• Programmable 8-bit or 9-bit data format
• Separately enabled transmitter and receiver
• Programmable transmitter output polarity
• Programmable receive input polarity
• 13-bit break character option
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 1039