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Chapter 23
UART Modules
This chapter describes the use of the universal asynchronous receiver/transmitters (UARTs)
implemented on the MCF5282 and includes programming examples.
The designation "n" is used throughout this section to refer to
registers or signals associated with one of the three identical
UART modules: UART0, UART1, or UART2.
23.1 Overview
The MCF5282 contains three independent UARTs. Each UART can be clocked by the
system clock, eliminating the need for an external UART clock. As Figure 23-1 shows,
each UART module interfaces directly to the CPU and consists of the following:
• Serial communication channel
• Programmable clock generation
• Internal channel control logic
• Interrupt control logic
System Control
Module (SCM)
Interrupt
Controller
UART0 can be clocked by the DTIN0 pin. UART1 can be
clocked by the DTIN1 pin, and UART2 can be clocked by
DTIN2.
MOTOROLA
NOTE
UART
Internal Channel
Control Logic
Interrupt Control
Logic
Figure 23-1. Simplified Block Diagram
NOTE
Chapter 23. UART Modules
Serial
Communications
Channel
Programmable
Clock
Generation
UCTS
URTS
URXD
UTXD
System Clock
or
External clock (DTINn)
23-1
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