INS8250-B - National Semiconductor

INS8250-B Asynchronous Receiver/Transmitter

Each of these parts function as a serial data input/output interface in a microcomputer system. The system software determines the functional configuration of the UART via a TRI-STATE® 8-bit bidirectional data bus. The UART performs serial-to-parallel conversion on data characters received from a peripheral device or a MODEM, and parallel-to-serial conversio.

Features

■ Easily interfaces to most popular microprocessors.
■ Adds or deletes standard asynchronous communication bits (start, stop, and parity) to or from serial data stream.
■ Holding and shift registers eliminate the need for pre­ cise synchronization between the CPU and the serial data.
■ Independently controlled transmit, receive, line status, and data set interrupts.
■ Programmable baud generator allows division of any in­ put clock by 1 to (216 - 1) and generates the internal 16 x clock.
■ Independent receiver clock input.
■ MODEM control functions (CTS, RTS, DSR, DTR, Rl, and DCD).
■ Fully pr.