IBM PC/AT Compatible

Two TL16C550 ACEs

Enhanced Bidirectional Printer Port

16-Byte FIFOs Reduce CPU Interrupts

Independent Control of Transmit, Receive,

Line Status, and Data Set Interrupts on

Each Channel

Individual Modem Control Signals for Each

Channel

Programmable Serial Interface

Characteristics for Each Channel:

? 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

3-State TTL Drive for the Data and Control

Bus on Each Channel

Hardware and Software Compatible With

TL16C452

description

The TL16C552 is an enhanced dual channel version of the popular TL16C550 asynchronous communications

element (ACE). The device serves two serial input/output interfaces simultaneously in microcomputer or

microprocessor-based systems. Each channel performs serial-to-parallel conversion on data characters

received from peripheral devices or modems and parallel-to-serial conversion on data characters transmitted

by the CPU. The complete status of each channel of the dual ACE can be read at any time during functional

operation by the CPU. The information obtained includes the type and condition of the transfer operations being

performed and the error conditions.

In addition to its dual communications interface capabilities, the TL16C552 provides the user with a fully

bidirectional parallel data port that fully supports the parallel Centronics-type printer. The parallel port and the

two serial ports provide IBM PC/AT-compatible computers with a single device to serve the three system ports.

A programmable baud rate generator is included that can divide the timing reference clock input by a divisor

between 1 and (216 ? 1).

The TL16C552 is housed in a 68-pin plastic leaded chip carrier.