mcf5307cft90b Freescale Semiconductor, Inc, mcf5307cft90b Datasheet - Page 311

• Manufacturer Part Number: mcf5307cft90b
• Description: Mcf5307 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Chapter 14
UART Modules
This
receiver/transmitters (UARTs) implemented on the MCF5307 and includes programming
examples. All references to UART refer to one of these modules.
14.1 Overview
The MCF5307 contains two independent UARTs. Each UART can be clocked by BCLKO,
eliminating the need for an external crystal. As Figure 14-1 shows, each UART module
interfaces directly to the CPU and consists of the following:
The serial communication channel provides a full-duplex asynchronous/synchronous
receiver and transmitter deriving an operating frequency from BCLKO or an external clock
using the timer pin. The transmitter converts parallel data from the CPU to a serial bit
stream, inserting appropriate start, stop, and parity bits. It outputs the resulting stream on
the channel transmitter serial data output (TxD). See Section 14.5.2.1, “Transmitting.”
The receiver converts serial data from the channel receiver serial data input (RxD) to
parallel format, checks for a start, stop, and parity bits, or break conditions, and transfers
the assembled character onto the bus during read operations. The receiver may be polled-
or interrupt-driven. See Section 14.5.2.2, “Receiver.”
• Serial communication channel
• Programmable transmitter and receiver clock generation
• Internal channel control logic
• Interrupt control logic
chapter
System Integration
Module (SIM)
Controller
Interrupt
describes
Freescale Semiconductor, Inc.
Figure 14-1. Simplified Block Diagram
For More Information On This Product,
the
Internal Channel
Interrupt Control
Control Logic
Chapter 14. UART Modules
Go to: www.freescale.com
Logic
use
of
UART
the
Communications
Programmable
Generation
Channel
universal
Clock
Serial
asynchronous/synchronous
CTS
RTS
RxD
TxD
BCLKO
or
External clock (TIN)
14-1