描述 Description

The SC16C754B is a quad Universal Asynchronous Receiver/Transmitter (UART) with 64-byte FIFOs, automatic hardware/software flow control, and data rates up to 5 Mbit/s (3.3 V and 5 V). The SC16C754B offers enhanced features. It has a Transmission Control Register (TCR) that stores receiver FIFO threshold levels to start/stop transmission during hardware and software flow control. With the FIFO Ready (FIFO Rdy) register, the software gets the status of TXRDY/RXRDYfor all four ports in one access. On-chip status registers provide the user with error indications, operational status, and modem interface control. System interrupts may be tailored to meet user requirements. An internal loopback capability allows on-board diagnostics.
The UART transmits data, sent to it over the peripheral 8-bit bus, on the TX signal and receives characters on the RX signal. Characters can be programmed to be 5, 6, 7, or 8 bits. The UART has a 64-byte receive FIFO and transmit FIFO and can be programmed to interrupt at different trigger levels. The UART generates its own desired baud rate based upon a programmable divisor and its input clock. It can transmit even, odd, or no parity and 1, 1.5, or 2 stop bits. The receiver can detect break, idle, or framing errors, FIFO overflow, and parity errors. The transmitter can detect FIFO underflow. The UART also contains a software interface for modem control operations, and has software flow control and hardware flow control capabilities.
The SC16C754B is available in plastic LQFP64, LQFP80 and PLCC68 packages.

特性 Features

4 channel UART
5 V, 3.3 V and 2.5 V operation
Pin compatible with SC16C654IA68, TL16C754, and SC16C554IA68 with additional enhancements, and software compatible with TL16C754
Up to 5 Mbit/s data rate (at 3.3 V and 5 V; at 2.5 V maximum data rate is 3 Mbit/s)
5 V tolerant on input only pins
64-byte transmit FIFO
64-byte receive FIFO with error flags
Industrial temperature range (-40 Cel to +85 Cel)
Programmable and selectable transmit and receive FIFO trigger levels for DMA and interrupt generation
Software (Xon/Xoff)/hardware (RTS/CTS) flow control Programmable Xon/Xoff characters
Programmable auto-RTS and auto-CTS
Optional data flow resume by Xon any character
DMA signalling capability for both received and transmitted data
Supports 5 V, 3.3 V and 2.5 V operation
Software selectable baud rate generator
Prescaler provides additional divide-by-4 function
Fast data bus access time
Programmable Sleep mode
Programmable serial interface characteristics 5, 6, 7, or 8-bit characters
Even, odd, or no-parity bit generation and detection
1, 1.5, or 2 stop bit generation
False start bit detection
Complete status reporting capabilities in both normal and Sleep mode
Line break generation and detection
Internal test and loopback capabilities
Fully prioritized interrupt system controls
Modem control functions (CTS, RTS, DSR, DTR, RI, and CD)
Sleep mode