SCC2691 Datasheet | NXP Semiconductors

DESCRIPTION The Philips Semiconductors SCC2691 Universal Asynchronous Receiver/Transmitter (UART) is a single-chip CMOS-LSI munications device that provides a full-duplex asynchronous receiver/transmitter. It is fabricated with Philips Semiconductors CMOS technology which bines the benefits of high density and low power consumption. The operating speed of the receiver and transmitter can be selected independently as one of 18 fixed baud rates, a 16X clock derived from a programmable counter/timer, or an external 1X or 16X clock. The baud rate generator and counter/timer can operate directly from a crystal or from external clock inputs. The ability to independently program the operating speed of the receiver and transmitter make the UART particularly attractive for dual-speed channel applications such as clustered terminal systems. The receiver is quadruple buffered to minimize the potential of receiver overrun or to reduce interrupt overhead in interrupt driven systems. In addition, a handshaking capability is provided to disable a remote UART transmitter when the receiver buffer is full. The UART provides a power-down mode in which the oscillator is frozen but the register contents are stored. This results in reduced power consumption on the order of several magnitudes. The UART is fully TTL patible and operates from a single +5V power supply. PIN CONFIGURATIONS RDN Rx D Tx D MPO MPI A2 A1 A0 X1/CLK X2 RESET 1 2 3 4 5 6 7 8 9 10 11 N24 AND D24 PACKAGES 24 23 22 21 20 19 18 17 16 15 14 13 VCC WRN D0 D1 D2 D3 D4 D5 D6 D7 CEN INTRN GND 12 5 A28 PACKAGE FEATURES 11 12 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol VCC RDN Rx D Tx D MPO MPI NC NC A2 A1 A0 X1/CLK X2 RESET Pin 15 16 17 18 19 20 21 22 23 24 25 26 27 28 18 - Full-duplex asynchronous receiver/transmitter - Quadruple buffered receiver data register - Programmable data format: - 5 to 8 data bits plus parity - Odd, even, no parity or force parity - 1, 1.5 or 2 stop bits programmable in...