SC68C2550BIB48数据手册恩XP中文资料规格书

描述 Description

OverviewThe SC68C2550B is a two channel Universal Asynchronous Receiver and Transmitter (UART) used for serial data communications. Its principal function is to convert parallel data into serial data and vice versa. The UART can handle serial data rates up to 5 Mbit/s.
The SC68C2550B provides enhanced UART functions with 16-byte FIFOs, modem control interface, DMA mode data transfer. The DMA mode data transfer is controlled by the FIFO trigger levels and the TXRDYn and RXRDYn signals. On-board status registers provide the user with error indications and operational status. System interrupts and modem control features may be tailored by software to meet specific user requirements. An internal loopback capability allows on-board diagnostics. Independent programmable baud rate generators are provided to select transmit and receive baud rates.
The SC68C2550B operates at 5 V, 3.3 V and 2.5 V and the industrial temperature range, and is available in a plastic LQFP48 package.

特性 Features

•2 channel UART with 68 mode (Motorola) uP interface

•5 V, 3.3 V and 2.5 V operation

•5 V tolerant on input only pins

•Industrial temperature range

•Up to 5 Mbit/s data rate at 5 V and 3.3 V, and 3 Mbit/s at 2.5 V

•16-byte transmit FIFO to reduce the bandwidth requirement of the external CPU

•16-byte receive FIFO with error flags to reduce the bandwidth requirement of the external CPU

•Independent transmit and receive UART control

•Four selectable Receive FIFO interrupt trigger levels

•Software selectable baud rate generator

•Standard asynchronous error and framing bits (Start, Stop, and Parity Overrun Break)

•Transmit, Receive, Line Status, and Data Set interrupts independently controlled

•Fully programmable character formatting:
•5, 6, 7, or 8-bit characters

•Even, odd, or no-parity formats

•1, 1 1/2, or 2-stop bit

•Baud generation (DC to 5 Mbit/s)




•False start-bit detection

•Complete status reporting capabilities

•3-state output TTL drive capabilities for bidirectional data bus and control bus

•Line break generation and detection

•Internal diagnostic capabilities:
•Loopback controls for communications link fault isolation




•Prioritized interrupt system controls

•Modem control functions (CTS, RTS, DSR, DTR, RI, CD)