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General description

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.

Features

■ Member of IMPACT family: 3.3 V to 5.0 V, ?40 °C to +85 °C 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 16×

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

◆ External 1× or 16× 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 k? 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: 1× - 1 Mbit/s, 16× - 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