TL16C451FNR屬于集成電路（IC）的UART（通用異步接收器發(fā)送器）。由美國德州儀器公司制造生產(chǎn)的TL16C451FNRUART（通用異步接收器發(fā)送器）UART（通用異步接收器/發(fā)射器）接口是將來自微控制器或 CPU 的并行位轉(zhuǎn)換為串行位以便進行傳輸，或?qū)⒔邮盏降拇形晦D(zhuǎn)換為并行位以供其他微控制器或 CPU 使用的物理電路。UART 可以使用 RS232、RS422 或 RS485 協(xié)議進行數(shù)據(jù)傳輸，并根據(jù)通道數(shù)、數(shù)據(jù)速率和其他特性（例如內(nèi)部振蕩器、定時器、計數(shù)器、GPIO 和打印機端口）來選擇。

Integrates Most Communications Card

Functions From the IBM PC/ATE or

Compatibles With Single- or Dual-Channel

Serial Ports

TL16C451 Consists of One TL16C450 Plus

Centronix Printer Interface

TL16C452 Consists of Two TL16C450s Plus

a Centronix-Type Printer Interface

Fully Programmable Serial Interface

Characteristics:

– 5-, 6-, 7-, or 8-Bit Characters

– Even-, Odd-, or No-Parity Bit Generation

and Detection

– 1-, 1 1/2-, or 2 Stop-Bit Generation

– Programmable Baud Rate

(dc to 256 kbit/s)

Fully Double Buffered for Reliable

Asynchronous Operation

description

The TL16C451 and TL16C452 provide single- and dual-channel (respectively) serial interfaces along with a

single Centronix-type parallel-port interface. The serial interfaces provide a serial-to-parallel conversion for data

received from a peripheral device or modem and a parallel-to-serial conversion for data transmitted by a CPU.

The parallel interface provides a bidirectional parallel data port that fully conforms to the requirements for a

Centronix-type printer interface. A CPU can read the status of the asynchronous communications element

(ACE) interfaces at any point in the operation. The status includes the state of the modem signals (CTS, DSR,

RLSD, and RI) and any changes to these signals that have occurred since the last time they were read, the state

of the transmitter and receiver including errors detected on received data, and printer status. The TL16C451

and TL16C452 provide control for modem signals (RTS and DTR), interrupt enables, baud rate programming,

and parallel-port control signals.