Datasheet

UART Modules
12-2 MCF5206e USER’S MANUAL MOTOROLA
12.1 MODULE OVERVIEW
The MCF5206e contains two independent UART modules. Features of each UART
module include the following:
• UART clocked by the system clock or external clock (TIN)
• Full duplex asynchronous/synchronous receiver/transmitter channel
• Quadruple-buffered receiver
• Double-buffered transmitter
• Independently programmable baud rate for receiver and transmitter selectable from:
— timer-generated baud rate or external clock
• Programmable data format:
— Five to eight data bits plus parity
— Odd, even, no parity, or force parity
— .563 to 2 stop bits in x16 mode (asynchronous)/1or 2 stop bits in synchronous
mode
• Programmable channel modes:
— Normal (full duplex)
— Automatic echo
— Local loopback
— Remote loopback
• Automatic wakeup mode for multidrop applications
• Four maskable interrupt conditions
• Parity, framing, break, and overrun error detection
• False start bit detection
• Line-break detection and generation
• Detection of breaks originating in the middle of a character
• Start/end break interrupt/status
12.1.1 Serial Communication Channel
The communication channel provides a full duplex asynchronous/synchronous receiver
and transmitter using an operating frequency derived from the system clock or from an
external clock tied to the TIN pin.
The transmitter accepts parallel data from the CPU; converts it to a serial bit stream;
inserts the appropriate start, stop, and optional parity bits; then outputs a composite serial
data stream on the channel transmitter serial data output (TxD). Refer to Section 12.3.2.1
Transmitter for additional information.
Fr
eescale S
emiconduct
or
, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
nc...