DESCRIPTION

The ST16C552/ST16C552A (552/552A) is a dual universal asynchronous receiver and transmitter (UART) with an added bi-directional parallel port that is directly compatible with a CENTRONICS type printer. The parallel port is designed such that the user can configure it as general purpose I/O interface, or for connection to other printer devices. The 552/552A provides enhanced UART functions with 16 byte FIFO’s, a modem control interface, and data rates up to 1.5Mbps. Onboard status registers provide the user with error indications and operational status.

FEATURES

Added features in device revision F and newer:

• 5V Tolerant Inputs

• Pin to pin and functional compatible to ST16C452/ 452PS, TL16C552

• 2.97 to 5.5 volt operation

• Software compatible with INS8250, NS16C550

• 1.5 Mbps transmit/receive operation (24MHz)

• 16 byte transmit FIFO

• 16 byte receive FIFO with error flags

• Independent transmit and receive control

• Modem and printer status registers

• UART port and printer port Bi-directional

• Printer port direction set by single control bit or 8 bit pattern (AA/55)

• Modem control signals (-CTS, -RTS, -DSR, -DTR, -RI, -CD)

• Programmable character lengths (5, 6, 7, 8)

• Even, odd, or no parity bit generation and detection

• TTL compatible inputs, outputs

• Power down mode