參數(shù)資料
型號(hào)： MCF5407FT220
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 220 MHz, RISC PROCESSOR, PQFP208
封裝： 28 X 28 MM, 0.50 MM PITCH, PLASTIC, FQFP-208
文件頁(yè)數(shù)： 35/35頁(yè)
文件大?。?/td> 441K
代理商： MCF5407FT220
MOTOROLA
MCF5407 Integrated ColdFire Microprocessor Product Brief
9
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. Each 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 2.
Figure 2. UART Module Block Diagram
Each UART module consists of the following major functional areas:
Serial communication channel
16-bit timer for baud-rate generation
Internal channel control logic
Interrupt control logic
In addition, UART1 is enhanced to provide a CODEC interface for soft modem support. UART1 can be
programmed to function like UART0 or in one of three 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 on-chip baud-rate generator, which provides both standard and nonstandard baud
rates. 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.
Serial Communications
Channel
Interrupt Control
Logic
CTS
RTS
RxD
TxD
System bus clock
or
External clock (TIN)
Internal Channel
Control Logic
16-Bit Timer for
Baud-Rate Generation
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