mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 54

• Manufacturer Part Number: mcf5407
• Description: Mcf5407 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

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.
Each UART module consists of the following major functional areas:
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:
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:
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,
1-10
• Serial communication channel
• 16-bit divider for clock generation
• Internal channel control logic
• Interrupt control logic
• An 8-bit CODEC interface
• A 16-bit CODEC interface
• An audio CODEC ’97 (AC97) digital interface controller
• 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
System Integration
Module (SIM)
Controller
Interrupt
Figure 1-2. UART Module Block Diagram
Internal Channel
Interrupt Control
Control Logic
Logic
MCF5407 User’s Manual
UART
Communications
Programmable
Generation
Channel
Clock
Serial
CTS
RTS
RxD
TxD
CLKIN
or
External clock (TIN)