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.