Programmable Baud Rate Generator Allows
Division of Any Input Reference Clock by 1
to (216 −1) and Generates an Internal 16×
Clock
Full Double Buffering Eliminates the Need
for Precise Synchronization
Standard Asynchronous Communication
Bits (Start, Stop, and Parity) Added or
Deleted to or From the Serial Data Stream
Independent Receiver Clock Input
Transmit, Receive, Line Status, and Data
Set Interrupts Independently Controlled
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
− Baud Generation (dc to 256 Kbit/s)
False Start Bit Detection
Complete Status Reporting Capabilities
3-State 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
− Break, Parity, Overrun, Framing Error
Simulation
Fully Prioritized Interrupt System Controls
Modem Control Functions (CTS, RTS, DSR,
DTR, RI, and DCD)
Easily Interfaces to Most Popular
Microprocessors
Faster Plug-In Replacement for National
Semiconductor NS16C450

description
The TL16C450 is a CMOS version of an asynchronous communications element (ACE). It typically functions
in a microcomputer system as a serial input/output interface.
The TL16C450 performs serial-to-parallel conversion on data received from a peripheral device or modem and
parallel-to-serial conversion on data received from its CPU. The CPU can read and report on the status of the
ACE at any point in the ACE’s operation. Reported status information includes the type of transfer operation
in progress, the status of the operation, and any error conditions encountered.
The TL16C450 ACE includes a programmable, on-board, baud rate generator. This generator is capable of
dividing a reference clock input by divisors from 1 to (216 −1) and producing a 16× clock for driving the internal
transmitter logic. Provisions are included to use this 16× clock to drive the receiver logic. Also included in the
ACE is a complete modem control capability and a processor interrupt system that may be software tailored
to the user’s requirements to minimize the computing required to handle the communications link.