SC28L92A1A Datasheet PDF - NXP

Overview

●The SC28L92 is a pin and function replacement for the SCC2692 and SC26C92 operating at 3.3 V or 5 V supply with added features and deeper FIFOs. Its configuration on power-up is that of the SC26C92. Its differences from the SCC2692 and SC26C92 are: 16 character receiver, 16 character transmit FIFOs, watchdog timer for each receiver, mode register 0 is added, extended baud rate and overall faster speeds, programmable receiver and transmitter interrupts. (Neither the SC26C92 nor the SCC2692 is being discontinued.)

●Pin programming will allow the device to operate with either the Motorola or Intel bus interface. The bit 3 of the MR0A register allows the device to operate in an 8 byte FIFO mode if strict compliance with the SC26C92 FIFO structure is required.

●The NXP Semiconductors SC28L92 Dual Universal Asynchronous Receiver/Transmitter (DUART) is a single-chip CMOS-LSI communications device that provides two full-duplex asynchronous receiver/transmitter channels in a single package. It interfaces directly with microprocessors and may be used in a polled or interrupt driven system with modem and DMA interface.

●The operating mode and data format of each channel can be programmed independently. Additionally, each receiver and transmitter can select its operating speed as one of 28 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 DUART particularly attractive for dual-speed channel applications such as clustered terminal systems.

●Each receiver and transmitter is buffered by 8 or 16 character FIFOs to minimize the potential of receiver overrun, transmitter underrun and to reduce interrupt overhead in interrupt driven systems. In addition, a flow control capability is provided via RTS/CTS signaling to disable a remote transmitter when the receiver buffer is full.

●Also provided on the SC28L92 are a multipurpose 7-bit input port and a multipurpose 8-bit output port. These can be used as general purpose I/O ports or can be assigned specific functions (such as clock inputs or status/interrupt outputs) under program control.

●The SC28L92 is available in three package versions: PLCC44, QFP44, and HVQFN48.

●MoreLess

●## Features

● Member of IMPACT family: 3.3 V to 5.0 V, -40 Cel to +85 Cel and 68xxx or 80xxx bus interface for all devices

● Dual full-duplex independent asynchronous receiver/transmitters

● 16 character FIFOs for each receiver and transmitter

● Pin programming selects 68xxx or 80xxx bus interface

● Programmable data format

● 5 data to 8 data bits plus parity

● Odd, even, no parity or force parity

● 1 stop, 1.5 stop or 2 stop bits programmable in 1/16-bit increments

● 16-bit programmable counter/timer

● Programmable baud rate for each receiver and transmitter selectable from:

● 28 fixed rates: 50 kBd to 230.4 kBd

● Other baud rates to 1 MHz at 16x

● Programmable user-defined rates derived from a programmable counter/timer

● External 1x or 16x clock

● Parity, framing, and overrun error detection

● False start bit detection

● Line break detection and generation

● Programmable channel mode

● Normal (full-duplex)

● Automatic echo

● Local loopback

● Remote loopback

● Multi-drop mode (also called wake-up or 9-bit)

● Multi-function 7-bit input port (includes IACKN)

● Can serve as clock or control inputs

● Change of state detection on four inputs

● Inputs have typically > 100 kΩ pull-up resistors

● Change of state detectors for modem control

● Multi-function 8-bit output port

● Individual bit set/reset capability

● Outputs can be programmed to be status/interrupt signals

● FIFO status for DMA interface

● Versatile interrupt system

● Single interrupt output with eight maskable interrupting conditions

● Output port can be configured to provide a total of up to six separate interrupt outputs that may be wire ORed

● Each FIFO can be programmed for four different interrupt levels

● Watchdog timer for each receiver

● Maximum data transfer rates: 1x - 1 Mbit/s, 16x - 1 Mbit/s

● Automatic wake-up mode for multi-drop applications

● Start-end break interrupt/status

● Detects break which originates in the middle of a character

● On-chip crystal oscillator

● Power-down mode

● Receiver time-out mode

● Single 3.3 V or 5 V power supply

● Powers up to emulate SC26C92

●## Features