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1-10 MCF5407 User’s Manual

ColdFire Module Description

1.3.5 UART Modules

The MCF5407 contains two UARTs, which function independently. One UART has been

enhanced to provide synchronous operation and a CODEC interface for soft modem

support. Either UART can be clocked by the system bus clock, eliminating the need for an

external crystal. Each UART module interfaces directly to the CPU, as shown in Figure 1-2.

Figure 1-2. UART Module Block Diagram

Each UART module consists of the following major functional areas:

• Serial communication channel

• 16-bit divider for clock generation

• Internal channel control logic

• Interrupt control logic

UART1 is enhanced to provide a CODEC interface for soft modem support. UART1 can be

programmed to function like UART0 or in one of following modem modes:

• An 8-bit CODEC interface

• A 16-bit CODEC interface

• An audio CODEC ’97 (AC97) digital interface controller

Each UART contains an programmable clock-rate generator. Data formats can be 5, 6, 7,

or 8 bits with even, odd, or no parity, and up to 2 stop bits in 1/16 increments. The UARTs

include the following transmit and receive FIFO buffers:

• UART0 has a 4-byte FIFO receive buffer and a 2-byte FIFO transmit buffer.

• In UART1, the Tx and Rx FIFOs can hold the following:

— 32 1-byte samples when programmed as a UART or as an 8-bit CODEC interface

— 16 2-byte samples when programmed as a 16-bit CODEC interface

— 16 20-bit samples when programmed as a Digital AC ’97 Controller

The UART modules also provide several error-detection and maskable-interrupt

capabilities. Modem support includes request-to-send (RTS

) and clear-to-send (CTS) lines.

CLKIN provides the time base through a programmable prescaler. The UART time scale

can also be sourced from a timer input. Full-duplex, auto-echo loopback, local loopback,

Serial

Interrupt Control

Logic

CTS

RTS

RxD

TxD

CLKIN

External clock (TIN)

Internal Channel

Control Logic

Programmable

Clock

Communications

Channel

Generation

System Integration

Module (SIM)

Interrupt

Controller

UART