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.